If you have an Amazon MC you might be aware that it will become a bog standard Halifax one in a few weeks. I only used mine to collect points for Amazon Vouchers and so have been on the hunt for a new one. I got a email today advertising the Play.com Visa Card (MBNA) which offers 1 point per pound spent anywhere (2 points at Play.com). This is even better than the 0.5 point per pound given by Amazon!
Also spend £150 in the first three months and get a £15 voucher straight away.
The offer is linked off the play.com home page (small banner at the top).