Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
TweepsBook - A better bookmarking tool for power Twitter users that you can use to filter, organize and bookmark tweets on your liking.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Tweetflick - Save, organize & find Tweets to get the most out of Twitter
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.