Vista Fast Shutdown

Here's a neat one I fell over somewhere on the web:
Open Regedit (WINDOWS KEY + R on your keyboard, or by clicking Start and typing on the search bar "regedit" without quotes. Hit Enter

Navigate to [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l] On the right panel look for the "WaitToKillServiceTimeout" string and change it value to 1000 by right clicking the string and selecting Modify...

Default Value WaitToKillServiceTimeout=20000

Modified value WaitToKillServiceTimeout=5000
Modified value WaitToKillServiceTimeout=1000 (extreme, use it at your own risk)

I found 3000 worked nicely but try the 5000 first. 3000 does sometimes leave some programs lagging which then need a further key click.