If your ad and/or picture is huge, please put it behind the friendly LJ cut.
Be shiny to each other.
That's pretty much it. You can advertise any Firefly or Serenity game here. You're also allowed to advertise an original universe game that's along a similar concept (ie: a space opera game, a western-themed game).
LJ, GJ, play by posts, chat, email, LARP, or tabletop games can be advertized here - basically any format.
No Star Trek, Star Wars, Harry Potter, Buffy, Celb, etc. etc.