Two awesome photo management apps that fit almost any workflow with a very clean, intuitive interface. Gwenview is a lighter program that's very easy to use and Digikam is a more professional one with some very advanced features.

Sounds like you're looking for ownCloud. It's still under heavy development but the file storage functions work very well and it's accessible on Mac, Windows & Linux via webdav and from everywhere else via a web interface. There are also a couple of mobile apps in the works and it runs on a standard LAMP stack. http://owncloud.org/index.php/Main_Page And a blog post about the current status: http://owncloudtest.blogspot.com/2011/06/owncloud-20-just-merged-with.html

It's really great to see this. One of linux's greatest weaknesses is the amount of duplication that happens. Sometimes it's necessary but a lot of the time the community would be better served by everybody working together instead of against each other. This is one of those times and I applaud the beryl and compiz devs for realizing that and having the good sense to swallow a little bit of their pride on both sides. I'm looking forward to the great things that will come out of this.