If you're excited for Valve's Portal and wish there was more Narbacular Drop in your Prey now, some intrepid 3D Realms forum modders have modded make-your-own-portals into the popular Human Head Studios game... a game which, as you might remember, accurately models what it might be like to be shrunk down to microscopic size and walk around inside of a woman's cervix. Florian Eckhardt

The Portal Wrench! [3D Realms Forums] (Thanks, Mike!)