Over at StomperNet, we've just released the Scrutinizer browser as a free download.
Here's a (video only) screencast of me using the Scrutinzer browser to shop for the XBOX 360 game "Assassin's Creed" at Amazon. It takes me 2 minutes. First, I find the 360 games category quickly @0:20, but chose the wrong game genre category, fighting @0:43. Next up, I chose adventure @1:08 (turns out it's in action).
After two wrong tries, I resort to search @1:15, but I'm set to search in the adventure category and have to reset it to search all xbox games. I finally reach the page @1:38, and add-to-cart, success.
We produced a super engaging 30 minute video with animation explaining this, but in short, the tool simulates the limited high resolution vision available to humans as they use the computer. The visual simulation allows me to zoom in and out of the page and illustrates the tunnel vision a user has given a specific goal.