I have a rar here that has some prefabs, open them in hammer to see how stuff is done. There is a ball dispenser, door & button and other goodies.

Sounds quite nice, too bad I'm at school now so I'll have to wait a couple of hours until I can play around with it

dload.php

just thought i'd warn you, most of these are custom made, not using the portal graphics\

They're not using the Portal models?