I have a Menalto Gallery site at http://album.skjaeve.net/. I want to switch to Zenphoto since ZenPhotoPress seems to handle Wordpress integration well, unlike Gallery2's WPG plugin. Are there any tools that can make this slightly less painful, or will I have to extract photo captions and metadata manually and map them to filenames in Zenphoto manually?

There is only a Perl script available: http://www.zenphoto.org/support/topic.php?id=2470&replies=2

I decided to write this Gallery2 to zenphoto migrator. Check it out here: http://apps.ouwu.com/confluence/display/pb/Gallery2+to+ZenPhoto+Migrator

I just finish the code and tested a bit. Will upload the package in a day or two .