Crohn’s and Colitis Foundation
http://www.ccfa.org/
The Crohn’s Forum is a vast resource for Crohn’s related support forums, for example Crohn’s in general, Humira, Remicade, Fistulas, Colitis, Diet, Surgery, etc.
http://www.crohnsforum.com/
Crohn’s and Colitis Team: The social network for those living with Crohn’s or colitis.
http://www.mycrohnsandcolitisteam.com/