A little while ago, I mentioned the StumbleUpon plugin for Firefox. Well, it's still one of my top timewasters (when I have time to waste) - if I want to cruise around the web with nothing particular in mind, I just whack the ol' StumbleUpon button a few times until something interesting pops up. I've found all sorts of weird oddities.
But the real clincher: I just updated to the newest version, and now there's a hotkey to toggle the toolbar visibility (my only pet peeve with the previous version). This sucker's definitely here to stay now! (As long as it works with Firefox 2.0, coming out tomorrow...)