One method I am looking at implementing is using OpenDNS on the machine and blocking most categories that are not work related as well as putting in a custom blacklist/whitelist. This would also allow for using OpenDNS's log feature. This is easy to circumvent though and makes life that much more difficult for the site manager who is trusted to use the machine for other uses.
Can anyone suggest a lite application or another method for restricting the use of the internet? I have been looking into disabling the private browsing features, with IE8 this is possible but with Chrome currently it is not. If its a software method I don't want to install an intensive application, I'd rather something simple that uses few resources.
Any ideas would be appreciated. For the time being I'll be implementing OpenDNS until a better option makes its self known :-)