Don't bother with new hacks; instead make your forums a nice community in general and people will come by word-of-mouth and stay because they like the interaction.
You can try a shoutbox and other popular hacks but they tend to increase useless posts. Also install a search-spider hack (one's in my profile, several have been released) so your threads get indexed.
Edit: noticed something else important: add a <title> tag; otherwise your search engine ranking will go through the floor.
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