I finally have enough screenshots and stuff worth showing off to make a thread. Since we're nearly completely done with world 1, you might be seeing more soon. We're trying to figure out right now how many worlds we want to finish before releasing a demo. Right now we're deciding between 2 and 4. This hack is being worked on currently by myself and Heisanevilgenius.
The finished product will have 11 worlds, 85+ levels/120+ exits, a new overworld, returning enemies from previous SMB games as well as brand new enemies, new blocks, new graphics, and new music. Basically an all-encompassing Mario hack. When this hack is done, it will be left unlocked so people can do what they want with it. I don't believe in locked hacks.
Right now the hack is a total mess and not fit for a demo. Rest assured when we are ready for a demo it will be uploaded here.
We are currently looking for some help with the hack. We're looking for a few people to do some minor graphic work (just a few enemies) and some custom sprites (a boss or two, and a level ender sprite -- basically things I can't do myself). We ARE NOT looking for beta testers right now. We have a small focus group. We may ask for beta testers in the future, however. But please don't ask. We also don't need help with levels, overworld, or music; we have those covered, thanks.
Anyway, I know you don't care about that, so on to the content.
Note that probably half of these screenshots are of levels that aren't yet done. Many graphics need replacing and some you see are placeholders. Though if you do have suggestions, let us know.
World 1 screenshots, showing off our midway point and infoboxes as well as some returning and new enemies. Also, stompable goombas, because I've never been a fan of some of SMW's changes, like the turnblock (although my co-author adores them).

More scenery screens. The middle is the Yellow Switch Palace, which has no enemies, but has several puzzles Mario must figure out within the time limit.

Parts of our first monument level, and a castle screen. The thwomps in the first screenshot are power thwomps, identifiable by their battle scars. The third screen shows some on/off blocks.

The first two levels in water world. The first is Bill's Bridge, which is a linear level with bullet dodging. The second is a vast underwater reef with a large variety of enemies, including crabs, baby urchins, jellectros, and bloopers, in addition to the normal SMW fish.

Miscellaneous screenshots. The first is from the very unfinished water castle, which will have varying water levels based on where you enter. The second is from the forest, which has falling pinecones, giant bees, and very giant goombas. The third is a ghost ship. The first screenshot also shows a springboard in the item box. After applying the patch and reading that SDW:TLC didn't have the springboard graphics in the box, I decided to mull around until I could make it work.

A strange ghost house, a giant beehive (what game could be complete without one?), and a toxic mine which is full of gas bubbles and koopas wearing gas masks.

A level in ice world. One of my more popular levels, though it may be due to the music. The last few screenshots here are images of the overworld.

Ice world, underground world.

I've made videos of a couple levels to show off the full design and concept. They are slightly out of date, but should serve their purpose.
Toxic Mine:
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Melting Ice Cavern:
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My co-author is doing a brilliant job with the music for the hack. We're going to have completely original music (not based on anything -- with one exception) for the overworld and levels. Sorry, these aren't freely available for use, so please don't ask to use them. Here are a few of our favorite tracks.
Overworld Music:
Overworld Theme
Underground World
Bowser's Domain
Level Music:
Underground Theme 1
Ice Theme 1
Mystery/Wonder
The finished product will have 11 worlds, 85+ levels/120+ exits, a new overworld, returning enemies from previous SMB games as well as brand new enemies, new blocks, new graphics, and new music. Basically an all-encompassing Mario hack. When this hack is done, it will be left unlocked so people can do what they want with it. I don't believe in locked hacks.
Right now the hack is a total mess and not fit for a demo. Rest assured when we are ready for a demo it will be uploaded here.
We are currently looking for some help with the hack. We're looking for a few people to do some minor graphic work (just a few enemies) and some custom sprites (a boss or two, and a level ender sprite -- basically things I can't do myself). We ARE NOT looking for beta testers right now. We have a small focus group. We may ask for beta testers in the future, however. But please don't ask. We also don't need help with levels, overworld, or music; we have those covered, thanks.
Anyway, I know you don't care about that, so on to the content.
Screenshots
Note that probably half of these screenshots are of levels that aren't yet done. Many graphics need replacing and some you see are placeholders. Though if you do have suggestions, let us know.
World 1 screenshots, showing off our midway point and infoboxes as well as some returning and new enemies. Also, stompable goombas, because I've never been a fan of some of SMW's changes, like the turnblock (although my co-author adores them).



More scenery screens. The middle is the Yellow Switch Palace, which has no enemies, but has several puzzles Mario must figure out within the time limit.



Parts of our first monument level, and a castle screen. The thwomps in the first screenshot are power thwomps, identifiable by their battle scars. The third screen shows some on/off blocks.



The first two levels in water world. The first is Bill's Bridge, which is a linear level with bullet dodging. The second is a vast underwater reef with a large variety of enemies, including crabs, baby urchins, jellectros, and bloopers, in addition to the normal SMW fish.



Miscellaneous screenshots. The first is from the very unfinished water castle, which will have varying water levels based on where you enter. The second is from the forest, which has falling pinecones, giant bees, and very giant goombas. The third is a ghost ship. The first screenshot also shows a springboard in the item box. After applying the patch and reading that SDW:TLC didn't have the springboard graphics in the box, I decided to mull around until I could make it work.



A strange ghost house, a giant beehive (what game could be complete without one?), and a toxic mine which is full of gas bubbles and koopas wearing gas masks.



A level in ice world. One of my more popular levels, though it may be due to the music. The last few screenshots here are images of the overworld.



Ice world, underground world.


Videos
I've made videos of a couple levels to show off the full design and concept. They are slightly out of date, but should serve their purpose.
Toxic Mine:
<object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/Sw7l_dPgvfM"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/Sw7l_dPgvfM" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object>
Melting Ice Cavern:
<object width="425" height="350"><param name="movie" value="http://www.youtube.com/v/M1aT5DQsPpI"></param><param name="wmode" value="transparent"></param><embed src="http://www.youtube.com/v/M1aT5DQsPpI" type="application/x-shockwave-flash" wmode="transparent" width="425" height="350"></embed></object>
Music
My co-author is doing a brilliant job with the music for the hack. We're going to have completely original music (not based on anything -- with one exception) for the overworld and levels. Sorry, these aren't freely available for use, so please don't ask to use them. Here are a few of our favorite tracks.
Overworld Music:
Overworld Theme
Underground World
Bowser's Domain
Level Music:
Underground Theme 1
Ice Theme 1
Mystery/Wonder