The Grey Archive: The first fan fic site I ever found and still the best genre story site on the net. Check it out. Kudos to the admin.

T-S-S-A: The Television Sex Stories Archive.  This is another place I've got II:D hosted. Got a runner up prize for best series of 2003 no less :)  These guys are pretty awesome too.

Adult Fan Fic: Adult Fan Fiction archive.  Good little site but a little slow at times.  They have a good story hosting policy and lots of variety.

Literotica: The classic adult story site.  TONS of content. A few more restrictions then the others.

Robotech RPG:  An unoffical site that has an awful lot of good pics of the machinery/technology. Warning: depending on how far into my story you are you may find some spoilers there.

Marvel Comics: If you don't read comics you should.  Go here and buy some.