It has been awhile since I posted about Bricksmith, it looks like Allen Smith hasn't spent all his time pining for more TUAW coverage. Nay! He has been working on Bricksmith 2.0, which brings some new features to this open source Lego modeling app. The renderings have been improved, part search has been beefed up, and new addition to the Help file will aid those looking to create nifty models.
My favorite part of this app has to be the Minifig generator (which I used to create the image that accompanies this post). You can use it to create more aesthetically pleasing minifigs, to be sure, but this guy has got character I tells ya.
Bricksmith is free, but if you find yourself using it often a donation would be nice.