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incrediBILL - 8:15 pm on Jul 6, 2008 (gmt 0)
Of course it has also blocked a couple of browser plug-ins in the past which in one case caused a small riot and got the "http://" removed from the UA of that plug-in ;)
Since I whitelist Google, Yahoo, MSN, they go through first and then anything with "http://" in the UA is blocked so stuff like that is easily stopped.