You might seriously want to consider putting up an HTTP proxy--transparent or standard. And though I'm not the type to blindly tout Unix-only stuff in Windows groups, Squid (www.squid-cache.org) is really very cool, if you feel like a little learnin'. Got to know it while working on a (commercial) content filtering add-on...still use Squid, while the add-on was never as stable. :)
Or checkout SmoothWall (http://www.smoothwall.org). It's a Linux based firewall/proxy package that runs on intel hardware (I'm supporting 70+ users, with e-mail and web servers behind the firewall) on a PIII/733 with no complaints. Being very *nix-phobic, I snuck up on this thing, but I had it up and running within 20 minutes of skimming the manual, and it really works very well.
-- ------------------------------------------------------------------- illigitimi non carborundum ------------------------------------------------------------------- Bud Durland, CNE Mold-Rite Plastics Network Administrator http://www.mrpcap.com -------------------------------------------------------------------
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