East African Rift Zone, Great Rift Valley
What is the Rift Valley? - I like this site because it tells you basically what the rift valley is and important facts about it.
About East Africa - I like this site mainly because of the really cool pictures, it has some good info, too.
Glimpses of East Africa - I like this site because it tells you all about East Africa and why the rift valley is important to it
The Great Rift Valley Circuit - This is a great site, because it tells you how the rift valley works.
Ngong Hills, Kenya-Rift Valley - I like this site because it has a lot of good info. on the great rift valley.