Knowing that several of my buddies are fanfic lovers and are just dying for yet another something to lure them into spending way more time online than they should ***insert evil grin here***, here are the multi-fandom archives, old and new (to me anyway), that I found currently existing out in the e-universe. If I've missed any, please share!
Archive of Our Own
The Dark Vault
The Glass Onion
...Mightier than the Sword
The Wonderful World of Makebelieve