Stumbleupon new (to you) sites on the Internet

I’ve been playing around (thanks to Hal) with Stumbleupon (my new friend). Whenever I get a spare couple of minutes Stumbleupon will take me somewhere on the web it (other web users) thinks I’ll find interesting. I get to ‘thumbs up’ or ‘thumbs down’ on the sites suggested.  I’ll then get led off by other