This extension for firefox is too cool, I just had to put a link to it.
Bookmarks Synchronizer 0.9.6 (on this page)
http://update.mozilla.org/extensions/showl...egory=Bookmarks
It allows you to save your bookmark xml file to a remote folder, and then upload or download it... nice because it lets you keep a single bookmark file, and share that file amongst several machines/friends...