The creator of this awesome software called Sprite Lamp just posted about in a facebook group about his upcoming kickstarter and talked a little about it's software.
Basically, you can create dinamic shadows for 2d sprites, and it looks pretty nifty.
This a image found on his website, http://www.spritelamp.com/
<img src="http://snakehillgames.files.wordpress.com/2013/10/zombie_horizontalpreview_grey2.gif" border="0">
So, what do you think?