Update Oct 5th, 2011:
After trying to make sense of the traces of a SMD circuit PCB, when I've had the opportunity again to contrast the default camera app and my magnifier app, I think mine offers better magnification, although I can't really pinpoint the cause (close distance AF difficulties? some mild digital zoom on mine?).
Also, I have found a bug, the app as packed didn't have enough rights to set the focus, so it was silently failing to do it (on my dev copy run as root it has always worked fine).
The updated version is here (still without a proper icon):
http://brainsignals.de/users/cristia....1-2_armel.deb

I am not sure where it's the best place for such an update notice, in the announcement or as a reply to it, so it's both for now.