I've been looking at a plugin to expand my image gallery (hosted at my domain via opensource coppermine, not the flickr version) by using feeds -- basically, for each category I would have a feed. I looked at migrating to different systems, too: Gallery, plogger, and 4images.Here is the rundown of what I need:

• RSS Feeds per category/image album
• Ability to list an image in more than one category/album, e.g., black and white photographs all in one album + in subject albums
• Ability to assign keywords
• Easily customizable through CSS and maybe a sprinkling of php
• Opensource, hosted on my domain (I already have a several art/photography sites at social networking spots)
• Easy batch upload process
• Good enhancement and upgrade workflow
• Plus:
• Easy import/migration from Coppermine
• Bridging or crosswalking to Drupal
• Good documentation (I can usually make things work without a lot of help)
• Note the importance of easy!

Coppermine does all of that minus the feeds, but there is a feed plugin. To be honest, my only complaints with coppermine, have been 1)some of the developers/user community help -- it can get harsh 2)lack of built in RSS feeds and 3)crosswalking into Drupal -- it's doable, but not quite what I have in mind. Of course, using feeds would probably give me what I need, anyhow.So, in my various experiments and investigations:

• Plogger, Gallery, and 4images all have some form of a RSS.
• Plogger, Gallery, and 4images are all opensource.
• Plogger, Gallery, and 4images all seem to be relatively easy to install -- relatively.
• I can import/migrate my coppermine gallery into Gallery. I couldn't figure out if I could do that in plogger or 4images. 4images is primarily in German, so I hit some language barriers a few times.

..and here is my comparison chart -- I'm still trying to figure out some of the plogger features, so that part is a little bit incomplete.