I found these sites for you on Google:
Sickle Cell info center
Sickle Cell Disease Assoc of America
And if you want to find others, go to Inspire.com, there is a sickle cell anemia support group there. The whole site is for people with various chronic illnesses, its a very supportive community. I have sarcoidosis, you can find me there dwmom2008.
at 8:45 AM on May. 5, 2011