Soundamus gives you a feed of upcoming music releases of artists you listen to

If you have a last.fm account and you scrobble your music, soundamus lets you know when new music is being released from your last.fm data. All you have to do is put in your last.fm user name and it generates an rss feed, which you can then add to your favorite reader.

You can also add the info to your google, outlook or windows calendar.