Mmmmmmmmm 3d CAD. I used to use I-DEAS and have made hundreds of 3d models and assemblies - the surfacing tools are just so powerful. Rapid prototyping is just too cool for words, Stereo Lithography has to be the best, and the resins used now don't suffer from aging quite as badly as the early stuff did.
Now I changed job and have to use crappy 2d AutoCAD. I hate it, and I hate Autodesk.
STL, IGES, STEP ...mmmmm geeky stuffffff (in a Homer voice).
You guys got me going down Memory Lane.