JR:
Take a look at the SW section beginning here:
http://home.att.net/~castleisland/sw_lks.htm
There are extensive listings of available 3D files in various formats in one section. Most
are free, but you may have to fool around to get them into a buildable stl format. There
are also a few files available here and there at mfrs (SW and HW) and at some univ
sites.
If you're looking for something in particular, many people have had good luck posting
requests to the RPML.
Regards,
Ed
Ed Grenda
Castle Island Co.
The Worldwide Guide to Rapid Prototyping