http://www.apple.com/macosx/bootcamp/
Code:
Changes in Boot Camp 1.1 beta
Boot Camp 1.1 beta contains many updates and is intended for all new and previous Boot Camp beta users.
Boot Camp 1.1 beta includes:
Support for the latest Intel-based Macintosh computers
Easier partitioning using presets for popular sizes
Ability to install Windows XP on any internal disk
iSight camera support
Support for built-in microphones
Right-click when pressing the right-hand Apple key on Apple keyboards
Improved Apple keyboard support including Delete, PrintScreen, NumLock, and ScrollLock keys
It doesnt mention the sound fix there but if you read the FAQs on the site it says its been fixed So looks much better now for running XP/vista on the mac.