The HDView team at Microsoft have just released an update to their tools that allows you to export your giga-pixel images as a Silverlight Deep Zoom application directly from Photoshop CS3.
The tools can be downloaded from here:
After the install you do need to manually copy the “HDView.8be” file from the installed folder into your photoshop “plug-ins/import-export” folder.
The new screen looks like this:
Allowing you to choose either HDView, which gives you full 3D and HDR support using the clients hardware to render or DeepZoom powered by the lightweight Silverlight2 plug-in.