Some wonderful examples here. Great work.
I've developed the one roll of pinhole shots I took on WWPPD 2011. Alas, it would seem that the developer was "a bit" too old. Very, very thin negatives (including the frame numbering, which is why I rule out underexposure.)
On the WWPPD site, I see I have the opportunity to try again today or tomorrow, we've got the whole week. WWPPD is now WWPPW.