Xmarks is another browser add-on/plug-in/extension for IE, Firefox and Chrome. It does for your bookmarks what LastPass does for your passwords.
No longer do you have to update your bookmarks on each computer or in each browser that you use. Now they are all synchronized with a couple of clicks.
To me, Dropbox, LastPass and Xmarks is the holy trinity of data portability and cloud computing. Your bookmarks/favorites, passwords and files are all the same on any computer you use. What could be better than that?!