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PayPal plans an ad network built off your purchase history
(www.theregister.com)
This is a most excellent place for technology news and articles.
It's basically a credit card through an online bank that draws from a debit account.
For me, as a later of protection, I made a free capital one account (any will do, cap one was mostly random and i don't particularly endorse or hate them) and then the pdotcom "credit" draws from that. Their early implementation was using a prepaid debit card but they switched to credit like 2 years back and it's been good ever since. Even with other solutions I can't recommend enough taking a look.