Readability is a free toolbar button that's life-changing for Internet junkies:

David Pogue describes it here:
http://pogue.blogs.nytimes.com/2009/...lutter-online/

One click on the button in your toolbar and it clears all ads and clutter from a page leaving just the main text looking like an eBook and formatted the way you choose.

It's outstanding. Get it here:
http://lab.arc90.com/experiments/readability/

Haven't tested it yet in browsers other than Firefox.