I woke up this morning with an awesometastic merge request from Anton Keks. During the night (or was it already started weeks ago ?) he wrote a LiveWebGallery extension for F-Spot. It means that you can, using a web browser, see the whole (or only parts of) photo collection of someone else in your local network.
The HTML/js UI is pretty slick even !
The code is not merged yet, but I packaged the extension and it's now installable from within F-Spot (> 0.6.0.0) from the "Extension Manager" dialog.
More details can be found on Anton's blog.
[Update 2009/09/15. The code is now merged]
2 weeks ago