UPDATE 2/12/05: The file is back and available for download. You can find it in Nino Bilic's post by vising - http://blogs.msdn.com/exchange/archive/2005/02/11/371134.aspx
UPDATE 2/1/05: Looks like the link to download the ZIP is dead. No XBOX OWA lovin' for you! (or me, or us...)
One of the improvements in Outlook Web Access (OWA) in Exchange 2003 was what I refer to as the ability to "skin" the look of the interface. In Exchange 2000, OWA was made up of some javascript pages that also contained most of the design settings for things like color, font, images, etc. You couldn't modify it without modifing the code - a nasty proposition. Exchange 2003's OWA is built on ASP.NET and CSS. That's right, you can customize just about any part of OWA interface using simple CSS. An administrator can configure additional themes for OWA beyond what's "in the box" and an end user can then customize their OWA experience to their liking. It's a great feature.
Adam found that the Lee Derbyshire (www.leederbyshire.com) has been up to a little skinning of his own...building a XBOX-themed OWA interface.
http://blogs.msdn.com/exchange/archive/2004/08/13/214250.aspx