Hey Liz,
Yes, the Archive that we tend to refer to is
www.lcfanfic.com. A lot of the stories that have been posted on the Message Boards tend to end up on there eventually. But that's up to the author to submit them, and there are going to be some that don't go there.
Annesplace is the main nfic site, and she also has a PG fic site on there too - I've never done a comparison between her PG archive and THE Archive, but I'd imagine a lot of the stories are on both.
And don't worry about the amount of catching up...there's a lot, but it'll be FUN!!!
Jill