VirWox is rubbish. A complete waste of time with non-existent customer support. Definitely not worth the hassle. Looking forward to a more reliable service (that accepts paypal and/or credit cards for BTC) and if anyone knows of one please feel free to post it.
dingb.at accepts credit cards for small purchases, just not right now because they're changing providers. Excellent customer support, but it's a very small operation so don't expect it to work like a full-fledged exchange.