Microsoft has posted a complete version of the HD Photo plug-in for Photoshop CS3 and CS2. Here are the separate downloads for Windows and OSX. The same features are supported on both Windows and OSX. The files created with either version are fully compatible with Windows Vista, Windows Live Photo Gallery, the HD Photo Device Porting Kit, and several other applications that support HD Photo.
Thanks to Bill Crow at Microsoft for the update. You can listen to the This Week in Media Episode 51 in which he discussed the genesis of HD Photo and image compression. Just absolutely fabulous stuff.
