Anyway, the first step is to get an invite.
I went to the site and requested one: I am 30955th in line. Anticipated invite date: 26 Nov 2012. GAH!
Anybody out there have an extra one they'd be willing to give me?
ETA: [30 Aug] Thanks to lovely wendy of spn_j2_bigbang, I got my invite. http://archiveofourown.org/users/etrix. I'll be working over the next while to get all my stories switched over. I should probably do the text only ones, but likely I'll just jump in and figure out the image coding on the fly. =]