I'm tempted - can you buy a GBP (UK) Amazon voucher with that?
Probably, but I'd have to buy it from amazon.co.uk (gift cards are not transferable between .com and .co.uk) and that presents two challenges:
- I don't know what rate Amazon converts USD to GBP at, so I don't know what amount to enter in the card field.
- I don't know what the fees would be to use the card internationally. My guess is that they would be more than PayPal's respective fee to send money using a credit card.