I've been running my blog on subtext for almost a year now. Well it has been almost 18 months but I scrubbed the DB and started a fresh and aimed it more at techie stuff.
Something I also looked at previously was Community Server There are several versions but the version I have gone for to use is Express: http://communityserver.com/products/express/
it does have some restrictions but I cannot see my community server getting heavily used just now any way!
the install was relatively painless and I have it running in the same database as my subtext blog.
The next question is, is what to put on it?
At present there is nothing on there but I hope to put something on there soon. it also has a Wiki so I could perhaps start putting more on my how to's and things on there....
The new community can be accessed at: http://cs.kemponline.co.uk.