Will Cosgrove:

It’s been proposed that the world would be a better place without Retweets. If you would like to see what a no Retweet world looks like, click the Disable button to turn off retweets from all of the people you follow. Don’t like it? Turn it back on with the enable button.

If you’re a power user who has spent a lot of time fine tuning which accounts you get retweets from and which you don’t, this tool is not for you. It will heartlessly ruin all of your hard work. So don’t click either button.

I’m in the latter camp that can’t really use this (I use Twitterrific to manage this kind of stuff on a finer level) but for some of you, this might be useful.