I know this is a BackTrack Forum but Id like to get you expert advice on this topic.

The company I work for are looking to introduce a web filtering/reporting system.

One of the main features the system need is the ability to know if the website is in focus and for how long not just that the site was visited x amount of times. This is because the laws in Ireland are very grey to say the lest.

The setup is as follows, all Windows XP systems on an intranet that has two separate dedicated links to two different data-centres, are external Internet gateways are then split out over the data-centres backbone connection.
So what systems do my brethren BoFHs use in their realms or suggest I look at using?