crittercrazy - guineapigrehome is run by the same guys who do guinea pig cages.
Their hearts are in the right place and the cage method is the best I know of, but I do think the forum there is a little too militant, and extremely quick to jump on someone new if they make any suggestion of a mistake (breeding, outdoors etc). They scare off a lot of new people, whereas if they were more careful they might have helped a few more guineas out.
I still drop by there every now and again though!