Recently, yahoo website had reported that nokia might switch its mobile platform from symbian os to windows7 due to tough competition from apple's iphone (macosx for mobiles) and android (a google's linux which makes heavy use of java).
Symbian OS attempted usage of purely opensource tools such as python, perl, ruby, etc, and its fall also appears to be a blow for python, perl, ruby in the mobile platform too, since the other three make use of either java or dotnet and may or may not be others.
At some other site around six months back, there was a comparison between ubuntu (mobile), fedora (mobile), symbian os, android, moblin, etc. It concluded that ubuntu>moblin==android>symbian==fedora (probably gentoo/sabayon would be still more efficient).
However, currently the mobiles which we see today do not appear to give a provision for the end user to install their own os.
So, now that symbian os looks in danger, I hope that moblin, ubuntu, fedora and even sabayon (/gentoo) also find their way into this platform too, and meanwhile also hope that in future the end user gets a provision to install their own os in mobile platform too.