One of the smartest implementations of Google Wallet, is Google's inclusion of a prepaid card. This allows consumers to add funds to the card in a pay-as-you-go type service.

There was mention that one would need to add funds to the Google prepaid card from another card, but I suppose it's possible that it could be added in future directly from paypal, directly from your bank, or some other financial path.

That is very comprehensive, and great for those that wish to monitor their spending.