Watch this homeless guy with a Dog Cat and Rat.....all best friends :] Amazing!

Startaid.com - Very detailed but very clunky social bookmarking service.

Flinkin.com - a social bookmarking site where links can be stored into folders using a bookmarklet. link titles can't be edited. decent.

markme.me - a social bookmarking site. a basic bookmarklet dumps pages into your own page.

StumbleUpon.com - Not for bookmark organization. Good discovery engine with an excellent add-on. Attractive site.