Hollow Art Ads
I've not yet seen this here and I thought I would share.
Hollow Art (which everyone might know for their icons) recently acquired a web site when they got too big for LJ. hollow-art.com features an RPG directory for advertisements and along with the directory, they feature a random game each time you click on a new page or refresh in the sidebar. Since many roleplayers use Hollow Art to search for PB's or icons, it's a handy place to host ads.