Hello,
I have been experimenting with uploading images that include tags, title, description, etc. in the meta data. I have tried it with zenphoto versions 1.2.8 and 1.2.9. Using Picasa 3.0 to tag my images.
"Title" (returned as the filename of my image) and the "Description" appear uploading through the admin or FTP, but the tags didn't work.
"Tags" work using Picasa only when uploaded via FTP. If uploaded through admin, the tag doesn't show up, but can be added manually to the image and the "link" will work.
This approach worked for me in both versions.