Mac OS X only: Feel like you waste too much time on Facebook, Twitter, or some other internet time sink? Free application SelfControl is serious about blocking those distractions when you need to focus.
The app is dead simple to use. Just add any domain to the blacklist (like twitter.com), use the slider to set the time you need to block those distractions (from one minute to twelve hours), and click Start. SelfControl's timer counts down the time until you can get your next distraction fix, and in the meantime, all attempts to access that site will result in a dead page. SelfControl works in conjunction with any application on your Mac, too, so you can't just switch browsers and expect to get your fix elsewhere.
SelfControl is serious, too. Once you start the timer, you can't undo the blacklisting until the timer runs out—restarting your computer won't even help. SelfControl is probably the simplest, most serious distraction stopper we've laid eyes on. SelfControl is a free, open-source download, Mac OS X only. Thanks Johnny!
SelfControl [Steve Lambert]