Great addon; I've modified it to display yearly mosaics on my photoblog here:
http://fotoblog.pnjwood.com/index.php?x=about
I do have one question. When I used the download link here:
http://www.pixelpost.org/extend/addons/photo-mosaic/, the addon version in the php file said version 1.0, but the page says version 1.2.
Do I have the latest version, and the version number just wasn't updated? Or is the download link pointing to the wrong file?