It’s a new button on your Web browser’s toolbar. With one click, it eliminates EVERYTHING from the Web page you’re reading except the text and photos. No ads, blinking, links, banners, promos or anything else.
Ironically, he wrote about it on his blog surrounded by (among other things) a flashing ad for AMD, affiliate links to buy his books and a video of him playing with a mobile phone.
I never figured out how to add the bookmarklet to my browser. I was distracted by an ad called "I Got Rid Of My Yellow Teeth," and gave it a click because it seemed way more interesting than what I was reading.