At some point before long mashups will start becoming more utilitarian and less one-off novelties. Currently one of the more useful utilities built on web APIs is the blueorganizer Firefox extension from adaptiveblue (a ProgrammableWeb sponsor).
Payment is a critical piece of any application and new usage patterns have indicated that users are likely to do their purchase from a variety of devices and applications. It is important to create the right experience within the application so that the payment process is seamless to the user. Visa, one of the key players in the payment industry, has announced the launch of its developer program to consolidate all its offerings and push its new digital wallet service, V.me, that is slated to launch in early 2012. The V.me by Visa API is available to developers now for beta testing.