Remember the bad old days, when all you had to do to back-up your bookmarks was
to take a copy of Netscape's bookmarks.html file?
I've generally grown to distrust Cloud(tm)-based bookmarking services, because they have a bad habit of disappearing. (I guess Yahoo! realized that del.icio.us wasn't really profitable, shortly after they gobbled it up.) Such services tended to be black-holes anyway: I would add a bookmark, dutifully tag it, and promptly forget about it. Rinse-lather-repeat.
So naturally, I've decided to overload yet another Cloud(tm)-based service, in order to store bookmarks to the ridiculous number of tabs I generally keep open. I haven't decided on a format, or a sane way to keep it all organzied. Let's see how this little experiment goes...