I built a simple app that lets me create a mix, and email it to subscribers every week, called http://thekidsarebored.com . Using 8tracks.com and mandrill.com, it's mostly free (except for the music, and server). Enjoy!
It's a simple script, with an admin for me to run it. If you'd be interested in running your own, let me know and I'll put the source on Github.
