Interesting little tidbit that Andrew passed along - Tower Records is on the verge of launching a free podcast service. 

The 90-store chain plans to open a new online service this summer that lets consumers create their own podcasts--audio and video shows designed to be downloaded onto a computer or portable media player--using a catalog of some 6,000 songs, which Tower will provide free of charge.

So basically they are allowing users to create custom radio streams that you can take with you.  The entire service is free, with ads included in the most popular podcasts.

Great idea - and it's good to see them thinking creatively here instead of holding on to a dying business model.  Of course, the service won't include music from most of the major labels because there isn't enough DRM on it for their tastes.