Does no one use Diigo? My favorite part about it is how easy it makes it to add tags when you bookmark a page. You can easily call up things you've saved many years ago with a simple tag search. It's kind of like a better Delicious, back when Delicious was actually good. But I imagine it's also like a free version of Pinboard.

Plus it doesn't have that ridiculously large "modern" UI style that takes up so much space. Just a simple, no-frills interface with superb tagging and search.