Rdio Music Streaming Application has been updated with support for BlackBerry devices. And the are offering a free trial with this to say:
Some of the best things in life are free, and starting today, Rdio is one of them. New Rdio users in the US can take advantage of many of our popular features for free, including streaming full songs without hearing a single ad — a meter at the top of your profile will show you how much free music you have each month.
An email address or Facebook account is all you need to start listening for free, and no application downloads or credit cards are required. Just sign up at rdio.com or through one of our mobile apps to get started.