So at my new job one of the platforms we use is S60 (Nokia phones, Symbian OS) and I am getting curious about it, as well feeling the need to help the team a bit from time t
I would heavily recommend steering away from Symbian. It's an absolute nightmare to work with once you start needing multiple screens.
My team is currently converting a legacy Symbian app to the newer Qt on OpenC for S60. And it's an absolute dream. Native look but with "real" c++. You know, things like guaranteed construction etc... etc...
http://www.qtsoftware.com/developer/technical-preview-qt-for-s60