FlexGo: Introducing pay-as-you-go computing

Introducing pay-as-you-go computing: "Microsoft FlexGo makes it possible to lower the entry cost of PCs and let people pay for computers as they use them. This technology supports two models today: a pay-as-you-go model enabled by prepaid cards or a subscription model with monthly payments."

Link:
http://www.microsoft.com/whdc/flexgo/default.mspx