I did not know this about AO3's tagging! (I never did Delicious - heard about it.) And being able to tag fics as a reader... oh man, I would LOVE that. I wish AO3 could implement that outside of the bookmarking system, as a site-wide thing. Or a site that would be just for fic organization/rec'ing that would allow organizing of fic links from all manner of sites, including fandom-specific archives... Realized that outside of fan-made rec lists, there's no one place anyone can ever go for all the links to all the fics. Like AO3 but just for readers tagging/linking to fanworks only (not a general bookmark service), not hosting the content. Of course, if one did exist, it's very probable that I would waste far too much time on it, lol.