I've been developing for Symbian S60 3rd Edition since last year using Carbide.c++ under Windows. THe problem is that I moved to Mac OS X this year(bought a Macbook Pro) and when I was going to download Carbide.c++, I saw that it's Windows-only, because of the Requirements:
Microsoft Windows XP Professional Service Pack 2 or Microsoft Windows Vista (32-bit).
1 GB of RAM.
700 MB of free disk space for Carbide.c++.
1.8-GHz processor; x86 architecture.
ActiveState ActivePerl-5.6.1.635.
At least one Symbian OS platform SDK.
1,024 x 768-pixel screen capable of displaying 16-bit colour.
But there are any alternatives for Mac OS X?