rminder is an interesting new service: after registering, you can type a reminder into the web page — at the appropriate day and time, the service will call you and read the reminder. It's a simple and effective reminder service for mobile phone users. You can get up to 8 reminders per month (2 per week) for free. For $3-$9 per month, the service provides 15 to 60 monthly reminder calls. The pay service adds recurring reminders, customized reminders, and other features.
Bonus cool feature: it integrates with several calendar tools (including Google Calendar, iCal, Outlook, and others) to remind you of the things that are already in your calendar app.