Private eyes, please!

I had to find a way to hide my tracks since my the computer on my desk faces the entire office, I need to have a way to keep what I'm doing private. It's not that I shouldn't be doing certain things at work. I'm not looking at porn or surfing the internet all day long, it's just that I need some privacy at times. For instance, I was reading about the shootings at Virginia Tech this morning before school and my boss came by and read what I was looking at over my shoulder and made a comment about it. I didn't make me feel very comfortable. I know in America things are different. Bosses can literally log all activities, no problem.