Edit 1-19-09: TACA has changed the original 10 week to GFCF article. For the old article information see the article by Mary Romaniec (I think this is more detailed then the newer 10 week list).
TACA 10 Weeks to the GFCF Diet: TACA (Talk About Curing Autism) has a link for how to ease into the GFCF diet over a ten week period for those kids and families who need to take a more gradual start to the GFCF diet. It is spread out over 10 weeks. Thank you, guys, for setting this up! I know so many families have had great success and less frustration going this route.