You are right, packman, to be concerned that this patch (which is maybe the 5th time it has been reworked)could put IE6 in the tank. But, then, Microsoft really wants you to step up to IE7 anyway.
But, if this makes you paranoid, just think about Microsoft's Genuine Advantage. Now there is something to be paranoid about, especially after it is applied to Vista. The assumption is that Genuine Advantage only checks to make sure you have a non-pirated copy of its OS. But what if it is also checking to see if you have a file of "Copy-MyDVD-anti-RIAA-version" that gets around any kind of copy protection scheme which you may never have used but because it is on your PC, your Genuine Advantage says you have a pirated copy of their OS and they won't support you? Now there's paranoid.