GCal Notifier is a free service for Google Calendar users.
(Unfortunately, I have reached the limit of my resources and cannot support any more users at this time... so registration is closed on this site as of 5/7/2007).
UPDATE: Apparently Google has released a version of Calendar that support secondary calendar reminders. See this blog post for details. This makes the GCal Notifier service obsolete! It was nice doing business with you...
This service monitors your Google Calendar and sends you a personalized reminder email before your event. Currently (as of Mar 23, 2007), Google's built-in notification service only sends reminder emails for events on your primary calendar. If you are like me and like to separate your events into separate calendars for work, family, holidays, etc., then this service is for you!
This service is free to any Google Calendar user with a valid, verifiable email address, but I reserve the right to close registrations at some point in the future if demand outpaces my resources!
Questions? Email me: gcal <at> beldintechnologies.com