I've been getting an increasing number of hits to my websites via this service, so I finally decided to give it a try to see what's up.

The way it works, is that you signup for free, and then you get a "Stumbleupon" toolbar added to your browser. Any website that you go to, you can give it a thumbs-up or thumbs-down. You can also click on a "comment" button which will let you post your own comment, and/or view what other "stumblers" have said about the site. Sites can be sorted by categories, and you can also just click on the "Stumble" button which will take you randomly to highly-rated sites that are in categories that you are interested in. I played with it a bit, and nearly every site it took me to was an extremely interesting one. I could see myself wasting a *lot* of time with this....

StumbleUpon