We completely agree - it can really get confusing. So, we've filed in a small change to help you out. Hopefully, now you should see that we've also color coded the Recent 30 topics section appropriately and when you open up a thread, you'll see the topic title prefixed by the labels "Professional Forum" or "Casual Forum" which will help you distinguish which is which.
@all: thank you very much for your ideas and suggestions. We can't make PW better without your help so we appreciate the support.
And don't worry guys - this is not the only change that we're working on. As panicslayer aptly said, "slowly and gradually", more shall be revealed