Lifehacker: Featured Firefox Extension: TagSifter Slices and Dices Your Bookmarks by Tag. I like the tag expression syntax they have. muffins - (cookies + brownies) ?donuts (`?donuts` means "the URL contains 'donuts').
People have proposed a tag query syntax.
I guess this is obvious, but the reason tags are so powerful and have caught on so much is that tags are sets whereas "folders" are trees, and sets ⊃ trees.
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