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You don't necessarily have to tag them, if you pay a bit extra for full-text archive, then import your browser's bookmarks.

Are there any services where you can submit a URL and get a list of tags back curated by humans?

EDIT: Looks like Pinboard does this already! Mea culpa.

When you try to bookmark a page, it shows recommended tags based on the other users' tags. So I can safely answer yes.