Well, i've had a go at this lately, and the results are wishy-washy at best. My current experiences are with the MacBoox C2D 2.0GHz.
After spending a number of hours installing x64 editions of Vista and XP, I have concluded that neither are usable at this point. There *are* some Vista64 drivers for the AR5008 series of wireless adapters, however even though they installed properly, they will not detect any wireless signal. Sound seems to be the other issue, and unfortunately the Intel/Sigmatel Vista drivers do not even install on the Macbook
On the Vista x86 driver front, I have had some level of sucess with the wireless card, (Macbook Atheros 5416). Much like the Vista x64 driver, the Vista x86 driver does not seem to function properly, and will not pick up any wireless signals. However, there is a driver for Windows XP that will install, and it does function for what little time I kept Vista on the machine. You may find it here
http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-66449 Extract the executable, and you will find a WIN2KXP directory that contains the files you *might* be looking for. I also attempted to use the Intel/Sigmatel Vista drivers, and again they do not function, then I tried the XP drivers, and the machine blue-screened.
Because of these experiences, i'm going to hold off on Vista until a work set of drivers are found.