As noted earlier in fnord on HD Photo and OpenEXR Brendan Bolles thinks HD Photo is not too shabby. Now, from Photoshop News:
"Bill Crow, the Microsoft Program Manager for HD Photo (originally code named Photon) says on his blog [worth a look -ry], that the final versions of the plug-in for Adobe Photoshop CS2 and CS3 are available for download. The download is free.
The plug-ins are available for both Windows as well as Macintosh. For the Windows, XP SP2 or Vista is supported. For Mac, both 10.4 (Tiger) and 10.5 (Leopard) are supported. The plug-in development was done by Microsoft in conjunction with Pegasus Imaging Systems.
HD Photo, which uses an expanded color space named scRGB has the capability to encode high-dynamic range (HDR) images in a wider color gamut color space."
Also, if you have a Windows box and turn off auto updates, you might try Windows Live Photo Gallery, which helps you manage and share your photos and videos. This is an upgraded version of the iPhoto competitor in Windows Vista, and also supports XP and HD Photo images.