F-Spot is now running too! Just had install a newer release of gtk-sharp (1.0.6) and everything worked fine is very useable, even in this early stage of development: It impresses a very intuitive and well thought-out interface and speed, even though my fotos are located on a different computer and shared with shfs. With local photos it must be blazingly fast. One feature I particulary like is storing multiple versions of a photo, so that one can select which one to view by default. Many details and features have yet to be implemented, but I definetly recomed trying it out (Gentoo ebuild is here). You can also watch it in action on the video I linked in my last post.
Even though f-spot (and similar programms like Picasa) are doing a great job nowadays, I have not yet been able to solve my fundamental problem with digital photo archivating: Everybody in my family should be able to see all (well, almost all) pictures (over the lan) with all metadata (comments, location, event, order) and then edit this metadata and commit edits back to the central store.