There is an article cited on Slashdot that indicates that Vista may be reporting activity to several government agencies such as the DOD, Homeland Security, even the Chinese government. The packet sniffing done by the guy who "discovered" the spying is highly questionable and its not clear if its just nonsense or real. But hey, its fun to read!
http://yro.slashdot.org/yro/07/07/22/1712252.shtml