Stumbleupon.com and I have a love/hate relationship. It is great in that it acts as a way to surf the web in an area of interest to you. You pick what kind of sites you would like to see and click the stumble button and up comes a site that has something to do with what you typed in. Now here also lies the problem with stumbleupon. When you move on to the next site, you could end up looking at a website that you arent even able to justify how you got you in a seemingly completely different category. Also, you may land on a site that is relevent in category but is essentially just a spam site within it. Overall, I would recommend just heading over to one of your favorite search engines like Google, Yahoo, or even Bing to find stuff you like.