Sorry, I think you've failed to grasp what Apple's "Multitasking" is about. They are perfectly happy with apps that do not multitask AT ALL. They are not offering "true" multitasking, but allowing app's to notify system daemons to carry on CERTAIN tasks, e.g. IM notificiations, VoIP, downloading content. If an app doesn't want to do this, and there's no reason an App written in MonoTouch can't do this just as easily as an ObjC Cocoa app, that really doesn't matter to Apple.