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Using delicious.com for years, I am very disappointed. Weeks after Firefox 4 hit the market, Yahoo still fails to present a compatible addon. I know, there are work arounds. But even more so, Yahoo should provide a compatible solution out of the box.

Now I am looking into some alternatives:
http://www.google.com/bookmarks
http://www.diigo.com
and even http://www.evernote.com

How are you managing bookmarks/favorites to be used on different computers, browsers and platforms?