I recently completed an exhibition format plugin for Indexhibit that I want to share with the community. Please check out the project here and feel free to use it on your own site:
http://tboyko.github.com/Dock
In brief: the plugin allows for a thumbnail dock at the bottom of your screen, with a large, auto-scaled image consuming the rest. If you are interested in seeing a working demo, one is available at:
http://www.tylerwilliamparker.com/
Enjoy! Feedback appreciated!