Give us a username and we'll feed you anything that you've tagged as: "tagmindr" and "remind:YYYY-MM-DD" on any of the various services that we check. We'll remind you via RSS, SMS, Email or IM, so long as it's RSS.
(SMS, Email and IM coming later.)
Updates
WOW I've been a little busy. Turns out there was a bug in the updater script (that's probably been there for a long time now). This has caused a distinct lack of updated content from the service. That being said I've fixed it and you should all start seeing your reminders appear again. Sorry :-/ ~ Anders