If you're not going anywhere, and have a somewhat current version of Windows Media Player (WiMP) (There is a downloadable Mac version at this URL) you should immediately head to Microsoft's X-Box site. In a little over an hour from now (at 0930 Pacific time) Bill Gates will begin his keynote address at the Consumer Electronics Show (CES) in Las Vegas.
During that presentation, the Billfold is due to officially unveil the X-Box and talk about all of the wonderful things that will make it worth purchasing. Some expect that Halo may be discussed for a bit. If there are any difficulties for the Mac version of WiMP, I'm sure that once the broadcast has been completed, someone will be able to convert it to .mov or .mpg format.