@rohan – you can do the forums by activity. Click to http://www.shootuporputup.co.uk/forums/ and then all the threads should be ranked by “freshness”. There’s a drop down where you can then change it to sort by “most posts” or “not replied”.
TBH, if the forums did go wild then I would toy with moving it to new software. I’m currently using the Buddypress add on for WordPress and I think it’s okay – but not marvellous. The only bit I like really is the “Activity” stream which nicely combines both the blog and forums in one place. But, yes, if people are chatting away it can be a bit full on!