Thanks (all) for the info.
I realize the HOSTS file is a form of DNS but thought it was worth a try.

Our router is a Linksys - and limited to either blocking internal IP's, or blocking ports globally.

Can't cutoff their internet access' or they couldn't do their job.

I've blocked 'Bit Torrent' 'Kazaa' etc ports successfully (msn will use port 80 if available)

Thanks for the help - i'll keep on trucking