I know, I know — just one more thing about Batman: Arkham Asylum and I swear I'll shut up. But there's actually an Arkham Care website setup for the game.
Warden Quincy Sharp welcomes you to the site and there's an "Inside Arkham" video clip show that reminds me of the Kaiser Permanente health care ads they run out here in California. The dummy site very clearly states that it's for entertainment purposes only (in the bottom right hand corner of the page). But man, is it entertaining — especially if you've played the game enough to get the references.
Thanks for the tip, Kevin!