Are you using a blacklist? People already make blacklists that have a bunch of "bad" sites, so much of the work is done for you... Both DansGuardian and OpenDNS can apparently log. However, I just looked at DansGuardian some more and apparently it's a proxy that likely should be installed on another computer. That might be too much of a hassle. OpenDNS would probably be a simpler way to both filter and log. Although, the OpenDNS logs won't show you exactly which computer on your network went to a site.
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