Jaeden Stormes writes "We just started getting word of a new browser hijack from our sales force. 'Some site called Bing?' they said. Sure enough, since the patches last night, their IE6 and IE7 installations are now routing all NXDOMAINs to Bing. Try it out — put in something like www.DoNotHijackMe.com." We've had mixed results here confirming this: one report that up-to-date IE8 behaves as described. Others tried installing all offered updates to systems running IE6 and IE7 and got no hijacking.
Update: 08/11 23:24 GMT by KD : Readers are reporting that it's not Bing that comes up for a nonexistent domain, it's the user's default search engine (noting that at least one Microsoft update in the past changed the default to Bing). There may be nothing new here.