I used to block a lot of sites from the kids at home - found that homework time involved a whole lot of screwing around and it was starting to show in their grades.

They're crafty little shits though and started using proxy servers or proxy websites. These will allow you to surf blocked sites via a window from that site. A window in a window if you will. They said they used these at school all the time to view Myspace, Facebook, etc. that the school was blocking.

Now if they'd only put that sort of dedication and creativity into their school work!

My company is small, only about 12 people and nothing is blocked, tracked, anything. Our VP/boss is often founding screwing around playing Soduku on-line and looking at sailboats on CL for hours on end so if he's the guy setting the example then we're screwed.