Entropay works EVERYWHERE including adwords.
I second this. Been using Entropay (both virtual & plastic) for quite a bit and very happy with it. The only annoying thing is that each new VCC you create you must load with at least $20 - you can, however transfer money (any amount) between your VCCs (so if you don't need the $20 no a particular VCC you can just move it away to another one) but a 5% transfer fee applies each and every time.
P.S. Entropay is not available in the States.