I've got a teen forum, and I'm looking for more creative methods of promotion. Here's what I'm doing so far: Advertising on adwords Advertising on various websites Have a link building campaign going What else do you suggest? I have the money to buy more advertising, but there simply isn't any more good advertising space to buy here on DP, and I haven't found any good CPM networks to buy ads on.
What are the topics of the forum? Try advertising at popular blogs started by teens. It shouldn't cost you that much: teens usually need or want money, so you could pay some cash to a couple of bloggers for them to recommend your forum on a blog post.