Time for me to weigh in on this one:
First of all: Victor addressed the difficulties in releasing desktop applications for the Internet Tablet in the interview I just posted. It's about evaluating the market and doing the right application to fit right need at the right time.

My personal take on this: If I were sitting at a desk at Nokia, I'd say a Windows application is right for two reasons: 1: Reggie pointed out - most desktop users are still on Windows. 2: Linux and Mac users are generally smarter when it comes to handling video. There are lots of tools available to them and either they're very intuitive (Mac stuff) or they're aimed at smarter users (Linux stuff) so, naturally, Mac and Linux desktop software for video is a lower priority.

Yes - I just said Mac and Linux users are smarter than Windows users when it comes to video conversion. I expect some backlash for this. I wonder if it'd be more or less than the backlash being given to Nokia about having a Windows only app.