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It will remove the unnecessary things you don't want to see. I went to a post in my blog and clicked the Readability bookmarklet. It removed the video, the comments, and even the ads. It removed everything other than the actual content.
Readability is a very cool project. You can use it anywhere. My recommendation is to use it on MySpace, since they aren't the best-designed pages on the planet. If you want to read any page easier without fighting through nonsense, install Readability.
