This is a bit of a late reporting, but I wanted to share it anyway.
About 5-6 weeks ago (maybe longer?) I created a simple little service called Re/Spin, using the Rdio and Last.fm APIs, that allows you to import any Last.fm playlist into Rdio. It was my first foray into using Rdio’s API, and I think it worked out well.
As a gesture of appreciation and support for their community, Rdio was kind enough to send me an “I [listen to] Rdio” t-shirt and an Rdio sticker.