http://www.3dcontentcentral.com/
This site seems to contain well over 100 different drawings for LEGO parts and you can download it in any number of formats including for Inventor and Solidworks. I found this information at: http://www.chiefdelphi.com/forums/showthread.php?t=59107

Have you considered LEGO's own LEGO Digital Designer? I find that very intuitive for teaching. Even good enough for creating our building guides, without needing to go into professional CAD softwares. Before that we have been using LeoCAD, also cool and simple.

There are a bunch of options for CAD-like LEGO pieces, including MLCAD, importing modeled SolidWorks and AutoCAD drawings as they are available (although I have yet to find a set that is usable for NXT modeling), and then there is Digital Designer. While Digital Designer is possibly the most user-friendly, it is not great for instruction-making with sub-models and such, although screenshots can be taken and manipulated to form basic instructions with a little patience.

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