i love it. my bookmarks were getting out of control on my machine.
just for kicks, i tried del.icio.us on a pal's recommendation. at first, i didn't use it so much--however as soon as i got the hang of tagging my URLs i started using it all the time. i almost feel like an organized individual, now. almost. plus the little mp3 playtagger built into the del.icio.us system is way cool.