Xmarks

Xmark's is a life saver! It not only backs up your bookmarks but it will sync them between computers and between web browsers. No longer will you be on your laptop wishing you could remember the website you bookmarked on your desktop. No longer will you be wishing you could access your Firefox bookmarks in Chrome or Internet Explorer. Xmark's will seamlessly sync them all together.  It will even sync your saved passwords.

http://www.xmarks.com/