Me, I don't shop online much. Most online payment services are done across the internet are over SSL, it's incredible that there's still some way of cracking passwords and PINs. No liabilty clauses neither if your information is stolen in tr??nsit eventhough your computer is connected at that point. Or how about if your the goods don't come. The encryption vaults are really useful tools I agree, when you're at home. Microsoft has Windows Live ID digital wallets service for free.
If the employers/merchants haven't implemented something like Linovio's PaymentConnect on thier end. Then, PayPal, like you said is one of the best its so common. One brand new app I just found out about it is, FaceCash from Think Computer Corporation for smart phones it uses face recognition, only good at participating stores though. This may breakthrough.