Portal 2 official website
$50 saying they would've used thinkingwithportals if it wasn't taken. 
(Not serious)
Nameservers seem to confirm; that said, I find it odd that valve didnt come up with something else instead of paraphrasing it because thinkingwithportals was already taken.
Wow, I lol'd 
(percentage calculation sphere self-test failed!)
108.1% done, -8.1% remaining...
Released here!
All maps for Portal (1/2) worth playing are mirrored here.
I feel sorry for valve, but this may increase traffic to this site...
It most certainly will. Maybe not by much, but a few more visitors who wonder if this is the Portal official forum.
"Duct Tape is the answer."
It most certainly will. Maybe not by much, but a few more visitors who wonder if this is the Portal official forum.
you'd have to be pretty thick imo; theres no valve branding anywhere, and they keep all their game forums together on steampowered.com
And also this forum has died.
That's the spirit.
It's still alive, you just got to BELIEVE!