I myself have always found paid advertising to be as just as good as free advertising.
Blog posts that is the same niche as your forum/website that possibly have dofollow backlinks could gain you both some traffic and PR.
As well as posting at forums with the same niche as the website/forum you own and placing the website in your sig is also a good way to gain traffic, of course the backlinks are going to be nofollow but that won't really make that much of a difference.
Another form I have found to be useful is making affiliates with other websites/forums that are in the same niche as yours. This could possibly gain a fair few members if the other board is of a good size and can even gain some activity to your site from the staff of the other forum/website, I would as it helps out the affiliate which could return the favour.
Another one that I've been trying out is twitter, I haven't quite got the hang of it yet but with the tags, mentions and followings could possibly get you a small amount of users that are searching twitter for such a niche. As well as the free backlink that is nofollow from the tweet you did.
hope this has helped you a little bit. If you need any more help, just ask.
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