Oh come on!

Of course Amarok other great F/OSS software should be ported to proprietary systems! I'd love to be able to tip my friends (who would not benefit of using Ubuntu/Linux today) about this great program. Just like would never try to force Linux on someone that I do not believe will benefit from trying it out / switching I wouldn't try to indirectly force other's to use Linux.

For ordinary users, using Thunderbird, OO, Firefox and Gimp and other programs available cross-platform makes it easier to "take the plunge" and increases the freedom of choice between operating systems.

What's up with the "If it is only in Linux than user's will be forced to switch to use it and that's good" argument? That is like M$: "If we let .doc-files only be opened in our programs, user's will be forced to use our programs".

Where did the freedom aspect go? And do the ones saying this in this thread really believe that F/OSS has so few great pieces of software that we need to "hold on to what we can"? Maybe you should think again and take into perspective the vast amount of free functionality provided with Linux.

Port what is possible and let core functions naturally be available in the different operating systems. It shouldn't be the applications, but the OS that makes a difference. Try to port the freedom of being able to modify, customize, fix and distribute 95% of all software on your computer for free. That is naturally only possible where 90% already is proprietary - no matter how much GIMP and OO.org you have installed in those machines.