Yeah I've never used CampBX but with Tradehill shutting down, there isn't a more reputable non-Gox exchange that comes to mind. I'll probably start using CBX in the next week or two.
What rubbish, Intersango.com is by far the best bitcoin exchange available, it's now the second largest exchange, right after MtGox.
They're fully registered in the UK, have great customer service, and is the most professionally run exchange on the market, that are one of the few transparent exchange operations out there.
I can tell you from personal experience that they are excellent.