If you are a Web 2.0 fanatic (which, come on, who isn't these days?) then you probably know about Muxtape. For those of you who aren't religiously reading the latest Web application news at DownloadSquad, Muxtape is basically a way to share your personalized mp3 mixtape. Not only can you subscribe to the tape's RSS via iTunes, but it turns out that you can also listen to Muxtapes on your iPhone!
Just navigate over to the Muxtape page of your choosing and select a song. Mobile Safari will then load the file and begin to play it like normal mp3 audio. How cool is that?
Thanks for the info, Craig!