I think I may be a little late to this party, but I have only just discovered Pinterest, and am completely obsessed with it! It is essentially a group of virtual pinboards and you can add any and everything to them. You can also see what other people are pinning and re-pinning. I absolutely love it. It is exactly what I have been needing to organize bookmarks, and keep track of little things across the internet that I run across, mean to remember but then ultimately forget about. I also love that it's visual instead of my usual list of bookmarks.
Are you on Pinterest? I'd love to see your boards! If you need an invite (the site is invite only), leave your e-mail address and I'll send one over.