Marble 0.4 has been released and includes many new features (e.g. GPS, autodownloading satelite pictures, layers, .kml files, ...)
Just renaming marble-0.3.ebuild and changing SRC_URI to: "http://developer.kde.org/~tackat/${PN}/${PN}-${PV}-3.tar.bz2" worked for me.
That worked for me to on amd64. But the field with the projection option is gray (unavailable).
From the ChangeLog: 2007-07-19 Torsten Rahn <rahn@kde.org> - Adding a GUI item to change the projection. Disabled for now. Couldn't see an entry saying it was enabled yet.
Oh, that makes sense then. Sorry, I guess I was assuming too fast from the videos on commit-digest.org :]
I will try to take a look at this shortly - lots of big things in real life have reduced the amount of time I have to spend on this. Need to figure out how to get it to respect libdir for amd64 and then I will bump. One reason why I don't like cmake so much - things like this are not standardised like they are with the autotools.
Got it sorted sooner than I thought. Consider it bumped.