Microsoft has released a Camera Codec Pack that (finally) allows you to view RAW files from a variety of cameras when browsing through Windows Explorer. This is a really nice addition for photographers on the Windows platform.
[youtube http://www.youtube.com/watch?v=JjDXnLDQEjQ width=640]
Kudos to Microsoft.
Note that this is for Windows 7 and Windows Vista Service Pack 2.