Flickr wins in Wired News reader poll. Interesting that Odeo also gets high marks - need to go play with that. del.icio.us comes in at #3 - probably my fave.
Without del.icio.us, I'd be drowning in a morass of bookmark clutter. Seriously, drowning. Every article I've saved for later, every YouTube video I've earmarked for repeat viewing, every cache of free MP3s, every (ahem) NSFW page I come across. It all gets posted to del.icio.us. It's truly a lifesaver.