Install a shoutbox in your site, free and hassle-free, and all you need to do to get that done is take a look at InvisionPlus.net, which comes to provide basically the same service any other forum provider does: setting up your discussion board is easy, plus there are several skins to choose from; extensive support is to be found, just in case anything goes wrong, but the main services you’d expect from a forum these days, as in RSS subscriptions, image posting and password-protected rooms are provided by Invision Plus.
I was happy to see that a showcase of their most active discussion boards can be found on the site, alongside a complete directory of their forums sorted out by topic, so you can take a look around and get the general feel of the community before signing up. Interestingly, they offer a rather hard-to-come-across service, namely they can provide you with an extra backup of your forum for a fee. 
