Pathfinder D20 SRD Site

I don't play Pathfinder (although I'd be happy to play a pick up game), but I find sites like the D20SRD and now the Pathfinder D20SRD to be great resources. The D20SRD's "About" page says it well: it's a fast reference guide, it's more durable (we'll see!) than books, increases accessibility, and aids learning.