 websense
We use websense and I used to use SurfControl which websense recently purchased. I also have had experience with MimeSweeper for Web which I think went the way of the dodo.
I believe that most of the mainstream web filters tend to get their URL database from Websense. I know that was the case with MimeSweeper and also the webfilter module for Cisco ASA. My only advice is to avoid getting anything that proxies connections and get something more like websense which intercepts the connections and blocks banned content. The reason is that web filter proxies are pigs and can't take too many concurrent connections before you notice severe performance degredation. MimeSweeper used to say one server per 200 connections and that was a stretch. When a proxy filter starts failing, there goes your internet and you have angry customers. When websense fails, it fails open, so you aren't filtering but people can still work.
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