Now that I've been using them for a while I'm completely addicted to using tags in my journal. (although I've been a big ol' procrastinator about tagging the previous 3 years of entries!)
I really like the way my bookmarks are currently set up in Safari, but I'm thinking that it would be nice to find stuff from any computer.
But aren't del.icio.us tags public? So what if I tagged my bank's homepage? Obviously people wouldn't be able to log into my accounts, but I don't really want everyone to know where I bank, what credit cards I have, who my phone company is, who my electric company is, etc. They're not secret or anything. It's just not something that one should advertise.