A warning - I uninstalled my 3Dsmax6 demo and was quite displeased at the leftovers:
Safecast (well known spyware - formerly known as C-Dilla) under the guise of Autodesk liscencing. (I would have said no to Safecast or C-Dilla at install, I didn't know Autodesk contained it) It also left behind other software components with no uninstall. After much manual deletion and registry edits I think I have purged the beast from my machine. I also found and removed a WebGain installation at the same time though I'm not sure if it is related to 3dsmax6.
Hopefully the Milkshape demo will not report my activities to a central server and leave third party spyware installed on my machine like 3Dsmax6 did.