I've complained at length about the performance problems with Windows Vista and Gigabit Ethernet. In the most common scenario, Windows Vista severely throttles the performance of Gigabit Ethernet if you are listening to music or watching videos, such as WinAmp or Windows Media Player. The problem is even worse if you have multiple network cards (including wireless cards.)
Service Pack 1 for Vista contains a workaround for the problem, but you have to modify the registry directly with RegEdit - there's no user interface to control the throttling. You can find a complete description of the change in SP1 at AnandTech, including instructions:
http://www.anandtech.com/systems/showdoc.aspx?i=3233&p=2
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