I work on the development of iPhone games.
I also ported one of our previous games to N900 (Flare Elite).

I remember feeling overwhelmed when I started with OpenGL ES 2.0 programming on N900, I was very confused about development between all those different things like Scratchbox, MADDE, QtSDK, emulators, simulators, changed roots, targets etc. etc.
Figuring out how to do stuff took a lot of time. It is easier now to start with OpenGL ES 2.0 with the newer versions of QtSDK and projects like Qt Game Enabler and QML.

I love to tinker and hack with my desktop linux and mobiles. I used scratchbox to compile kernel modules for a DVB-T receiver on the N900 and for building some software from debian repositories for Maemo. For the game I used QtSDK and MADDE.
I don't have much experience with development using Scratchbox, I mostly use it as a tool for compiling other peoples work.