Previously mentioned web service Backupify backs up all your online accounts (Gmail, Twitter, Facebook, Flickr, and a ton more) to the cloud, normally for a nominal fee — but until January 31, 2009, all Backupify accounts will be free with unlimited storage.
After this period, the service will go back to a paid pricing structure. Anyone who signs up for an account during this free period, however, will remain free — and unlimited — forever. So if you've been considering the service (or feel the need to backup your Gmail, Twitter, Facebook, Flickr, Wordpress or many other supported online accounts), now is the time to sign up. If you don't see your service listed, sign up anyway — they've announced that YouTube and Linkedin backups are coming soon, and they plan to continue to launch support for more services. It can't hurt — after all, it doesn't get much cheaper than free.