It has been confirmed that a USB/DVD tool in Windows used GPL code without releasing it under the GPL License. Now, Microsoft has agreed to release that tool's source code unders GPLv2. http://news.slashdot.org/story/09/11/13/2311232/Microsoft-Takes-Responsibility-For-GPL-Violation
I think taking the software down is a very boding/bodeable/bodeful/whatever thing to do. I wouldn't expect anything else unless they had concrete proof that there was absolutely no chance at all that there was even the remote possibility of a GPL violation.