I think I've accidentally closed my earlier post on this topic, so I'm really sorry for the repeat.
I upgraded my installations of wordpress about 5 days after 2.2 came out and now it seems one of them has been hacked.
You can view the disaster at digicoremusic.co.uk
I've found that they've messed with the theme but I'm leaving it for you guys to have a look.
The real problem is that I can't even login to the admin, it says 'invalid username' so they really have messed with it.
Wanted to let you know -- and also any help fixing would be wonderful! I've contacted my host so i'll keep you updated.