I could see some really interesting "widgets" that could use it. For instance, if you could swipe a UPC at a store and get an automatic pull-up of pricing from Google Products or MySimon or the like, in a way that relatively quickly let you know whether the store deal was a good one or not, that would be very interesting. Also if you could do something like swipe a book, movie, or music CD and get a review or get your phone to play preview snippets from iTunes or Amazon. Or for that matter, help you order the product online or buy the songs from iTunes or whatever.