Maybe leave it just a little while until the activity is impressive enough to not scare off potential posters. We've got a lot of posts for the time it's been up, but they're mostly by the more hardcore members. If prospective member comes along and sees only 3 or 4 people logged in they might not be too impressed.
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Perhaps a good idea to make the list of the online people a bit smaller.
The list is gettin rather long :O)