Hi Yves,
On the last news we were waiting for Microsoft lawyers to have a (quick ?) check of what and how. So althought these sources may be available in an editor or another, it is urgent to wait.
If you are boring, you can have a look at http://openstreetbugs.schokokeks.org/?zoom=9&lat=46.9994&lon=8.26899... Yves
It *is* *official* that we can use the data: http://opengeodata.org/microsoft-imagery-details
(Besides: they wouldn't include Bing's Aerial Images into P2 if the legal details weren't cleared..)
Regards, Thomas