Felix's Hammer Notepad
New old video, showing a Back-Stock test. Woo!
See the description for some technical stuff.
hehe, funny tubes 
Do you use scripts for that Mirrors? (Oh and i really like the idea to make the mirrors "fizzler" like )
Actually, no scripts are used (at least as far as I remember). It should be pure Hammer.
Another old video. If you've watched Aperture R&D (and you should, it's excellent) you'll recognize this invention from the Season Finale.
The matter is created temporarily from energy, and is reabsorbed after about 10 seconds.
when you go through, a rag doll of chell should come out of the matter creating portal, and have it lay dead for a min... or maybe have it mirror your actions.. instant coop
I'm still amazed on how you figured to use portals for the mirrors. I thought they were resource intensive?
Ben: I did at first, but ragdolls and portals don't mix. That's why the co-op bots explode when they die. Ragdolls spaz out if you put a portal under them.
Habzs: If you set a portal to rendermode 10 it will redirect things without requiring the fancy lighting calculations. 
I see. I didn't know changing the rendermode would affect portals. 