Re: t Tiggity, re: CC#'s & trust.
If you are in the UK / EU, then prepaid credit cards aren't such a good idea.
The biggest threat is not actually your credit card details being stolen in transit, which this guards against, but the vendor not supplying what you paid for. In the case, The Consumer Credit Act covers you if you use a real credit card, but not if you use a prepaid one.
Also, my card gives me 1% cashback. I would need to lose a lot of money and have the bank not refund it for some reason, before I would end up worse off than the cashback I've earned over the years.