[No longer discontinued. Currently on invite only]
Unmark is designed to help you actually do something with your bookmarks, rather than just hoard them. A simple layout puts the focus on your task at hand and friendly reminders keep you in line. Filtering options let you find what you're looking for.
Use Unmark free for as long as you’d like or upgrade to a paid account at any time. An open source version is available on GitHub. Fork it and set up your own install.