I just saw this kickstarter pop up on my facebook feed:
http://www.kickstarter.com/projects/finnmorgan/sprite-lamp-dynamic-lighting-for-2d-art
It looks pretty neat. It's basically a normal-map generator, but instead of doing it from heightmaps or 3d models, it works by having you (the artist) hand-paint how your sprite should be lit from 2 or more directions.
After that, it generates a textures with normals, depth, AO, etc so you can dynamically light the sprite.
A picture speaks 1000 words:
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I'm not making a 2D game, so I'm not likely to use it... Personally, it looks like it lets people get a lot of mileage from some simple looking assets!
What do you guys think? Anyone here making a game with 2D art who thinks this is cool / useful?