Many of us use apps to buy stuff these days, whether its grabbing the latest e-book from Amazon, or a Groupon for a day of pampering at the local spa. Seems obvious now, but it wasn't (at least according to the USPTO) in 2004, when Microsoft filed a patent application for the idea -- and that application was recently granted. The patent claims a way to make purchases through an network-connected portal with a "streamlined interface" (to "streamline" the process of parting you from your money, no doubt). The portal maintains a list of selling sites and exchanges info as needed to let buyers pick up what the sel
