RSGallery2 has a plugin hidden in the forum for Joomla 1.5 that allows the Joomla global search module to now include the gallery/photos in the search.

This is good news because its the main reason I switched from coppermine to RSGallery.  I like the closer integration RSGallery has with the Joomla web engine.

Anyhow, know now that when you type in your keywords in the search, it will now include looking in the gallery for any matching titles or descriptions that the photos may have with your entered keywords.