Squeet - Free Email RSS Reader
This is nothing particularly groundbreaking (RSS to Email), but it's still pretty cool when used with the "right" feeds. Over in the sidebar I've added a box where you can subscribe to my "All Playlists" feed from Music Now. Whenever I create a new playlist, the email will be sent with links to the detail page.
Sort of a subset of what Immedi.at is doing, although I never quite got that to work as designed. Take a whirl and let me know what you think.