Hopping on the CoolIris.com bandwagon, I would like to suggest a site-wide RSS feed of all the photos, that would be compatible with CoolIris. That way anyone with the CoolIris plugin could easily browse all the photos at once (in a separate window).

Don't think this would be too many photos for CoolIris to handle all at once. I have seen thousands of photos loaded into CoolIris from a Google image search.

If you still think that would be too many photos to view at once, perhaps you could see more provide some photo filtering rules (photo searching) and show the results with an RSS feed compatible with CoolIris.