Do U Stumble?

Has anyone heard of Stumble Upon? Great site - one of the fastest growing on the web - it is a new way to search. The way it works is you create a free account and then run through a quick checklist of things you are interested in (like Movies, Education, Science, Technology, Humor, etc.). When you are finished, it puts a little Stumble Upon button on your Internet Browser. When you click it, it takes you to various sites within your selected interested, based on the "Stumbling Patterns" of other users with similar interests. On each site you go to, there is a Thumbs Up & a Thumbs Down next to the Stumble Button... you click one or the other to say if you like the site. Then, based on your continued stumblings, it continues to take you to new sites based on the updated data you continue to submit via the Thumbs Up and Thumbs Down. I have found Countless education, math, science, and technology sites from using SU. The website is www.stumbleupon.com and I HIGHLY recommend giving it a try.