One of the most exciting features in SilverLight 2 is the Deep Zoom feature (read more about it and see a sample here).
Microsoft just released Deep Zoom Composer beta (codename "Seadragon") to allow you to turn your image galleries into deep zoom projects.
It requires .Net FW 3.5 (can be downloaded here) to run and the UI is simple and clear.
I tried it and it works - but as you know, I'm far from artistic, so don't take my word for it .
Download it here and the user guide here.