Cracking Mobile Executables (Symbian OS)

[omidgl]

I've got a Nokia 6600 mobile phone today and it seems that it uses a new Operating system that I've never heard about it (Symbian OS). As I've searched there are lots of tools for this OS and mobiles that use it.
I've got lots of new toys to play with
The Main processor of these mobiles is ARM processor.
IDA Pro can disassemble them but the instructions and APIs seems very strange to me.

Is there any one that has worked and reversed some of these new executables?

Regards
OMID