Social Pomodoro - Meet an accountability buddy for 25 minutes of focused work.
Pine.blog - The social combo of an RSS feed reader and blogging app
Focusmate - Distraction-free productivity via virtual coworking
Feedlivery - One email every week with posts from the feeds you follow
Habit List - Create good habits and break bad ones with the app that keeps you focused.
Gnowtify - Twitter reading and sharing made simple