Jeez, this is my 3rd Vacuum pump post, but hey, why not.
I found a great site that has mechanical schematics, including exploded view drawings, for many of the well known vacuum pump types. So when your pump breaks or needs an overhaul, do it yourself!
http://www.precisionplus.com/schems/schem.html (http://www.precisionplus.com/schems/schem.html)
Also, SWIM ran across an Edwards E2M2 pump. Is this one good for vacuum distillations, etc?