According to this post on TUAW, Wal-Mart is going to start carrying the iPod Shuffle. I find this very interesting because the Wal-mart music store uses Windows Media DRM not FairPlay DRM that is supported by the iPod. What's especially amusing is that on the front page of the Wal-Mart Music Store is a Windows PlaysForSure notice reminding customers to look for the logo on digital audio player boxes to ensure that their player is compatible with downloads from the Wal-mart Music store.
Chances are that you are not likely to see the logo above on an iPod box in the foreseeable future, although if there were ever a company that could cause compatibility to happen, it would be Wal-Mart.
By the way: Just like Sony Connect, don't even bother trying to access the Wal-Mart Music Store with Firefox.