This is an opensource project, which goal is to create a multi platform photo manager and viewer (well, there is a basic support for videos too and music is planned), being able to use any backend for file storage : (your computer, friends computers, Picasa, Flickr, FaceBook, ..) while keeping the same features (copy, edit metadata, 3D slideshow, …).
ShareMedia is developed on top of the Eclipse RCP framework.
The project page is http://sourceforge.net/projects/sharemedia.
Hum, most other links are currently dead because of Sourceforge recent changes and because I lost a server. Be patient :-). Note : current activity is focused on Gallery widget and ShareMedia/RIM commons.