Autodesk Inventor

[#1]

Keep em coming Doug! I wouldn't mind trying to build a virtual lego assembly.  Maybe a weekend project of some sort. 

[#2]

Lego Window

[#3]

still on 2011 here, what version are these files in Doug?

TIA

[#4]

Thanks guys, just to add to the list:

http://www.3dcontentcentral.com/default.aspx

just search lego. I downloaded all of the lego gears / axles that I needed. Just be careful, the search bar is very precise and doesn't appear to have a "closest results" feature. I entered "lego gears" the first time around, and there were 0 results. I then typed "lego gear," and the gears came up.