Turn all the desks round so that the monitors are facing 'out'...
Be careful monitoring other peoples computers...the staff may revolt if they find out !
If you don't own the company...make sure your Bosses are aware of what you are doing, otherwise it could be you that ends up in trouble.
You should really make sure that there is something in each employees Terms and conditions that states the company may monitor PC activity...
If the company has a decent hardware Firewall you can also use the logs from that to see what machine is viewing what websites...when !
You would need each Machine to be assigned a static IP address though, for this to work efficeintly...
Another vote for ARD, I have used it extensively.
regards
Ric