These things rock!!!

Everyone! Party at my place! Bring your paper cars!

Yeah baby! Yeah!

What kind of printer paper should I use for these? Anyone know anything about that sort of stuff? Any mechanics out there?

As I recall, it's best to use a heavier paper than the normal 80g/m^2 that's used in most printers, with a 160g/m^2 being preffered. Not sure if the US has the same weight notation as the EU, but you want a paper like an "official" invitation.
I also wish to try a few of the papercrafts figures I have, but I keep postponing it, maybe I'll manage to print a few this month (or the next).

If you do make them, be sure to post a few pictures :)

If you have made them or do end up making them, please post pictures! :) EDIT: Oh yeah, what JMich said. :)