Remember Birthdays with Computer Reminders

Yahoo! Calendar

With a free membership at Yahoo!, you can take advantage of the site's calendar feature, which allows you to schedule all kinds of appointments with alarms sent to your Yahoo! Messenger account, mobile device, or e-mail address. If you choose to share your calendar with friends and family, they can view your dates and add their own.
 Cost: Free.
 

BirthdayAlarm.com

This service features an easy interface, e-mail or text-message reminders, a selection of e-cards, and an option to send flowers.
 Cost: Free e-mail reminders; 50 cents for each text message.
 

BigDates.com

BigDates will remind you of a birthday via a cell-phone text message or an e-mail with suggestions for cards and gifts. You can even sign up for a service that will send a paper card to someone through the U.S. Postal Service ($3, plus postage). The downside is that it's slightly impersonal; you don't get to compose the message in your own handwriting.
 Cost: Free for the first three months; $10 a year after that.
 

HappyBirthday.com

Boasting a tasteful, simple, and thoughtful interface, this site assigns each member her own Web page so she can direct friends and family there to input their birthdays, rather than having to collect the information herself.
 Cost: Free.
 

BirthdayPal.com

Birthday Pal keeps track of as many birthdays as you like and will send up to four different reminders per birthday. It also automates the process of birthday collection by sending an e-mail to friends requesting their dates.
 Cost: Free.