At the South by Southwest Interactive Conferece in Austin, Texas this past week, Mashery hosted a contest, Circus Mashimus to encourage people to create mash-up applications using their customers' web services. I learned about it a week before and decided to create an entry with Silverlight 2 using web services from Best Buy, The New York Times, Billboard, and Intelepeer (not a Mashery customer but one of our partners). The mashup is an artist explorer that lets you research musical artists using the services and then lets you send an SMS message about your findings to anyone's mobile phone.
Try it out at http://xmldocs.net/artists – I did a short screencast for Channel 9 about the Mashup and you can watch it on the About tab of the mash-up.
I will be releasing Silverlight kits with source code for each of the APIs (Best Buy, The New York Times, Billboard, and Intelepeer) shortly as I complete them - watch this blog for more info on the kits (subscribe here). With these Silverlight kits, developers and designers can access these services and build cool applications and mashups with little to no coding - just Expression Blend.