[dave256]

Not speaking for OmniFocus (I don't work for them), but they are clearly an Apple shop. Supporting another platform would be incredibly difficult and time-consuming. A lot of code can be shared between the desktop and iPhone/iPad versions since they all use Objective-C and variations on the Cocoa framework, but a different platform would require a complete rewrite from scratch. I think at one point they had discussed the possibility of a web version in the future, but I suspect iPad development has forced that on to the back burner if they're even still considering it. If you want to take OmniFocus with you, the only option in the near future is to get an iPod Touch if you want to keep your Symbian phone.