I did a quick lookup, not enough to be sure, but... Appcelerator Titanium desktop looks very promising to me. I'm mostly a web developper so that environment fits me well. Qt however looks more robust, but I think I could get the job done quite fast in Titanium Desktop. As for now I'll leave the mobile platforms alone.

Unless there's a good reason not to try TD I'll look into that tomorrow, hardly can't wait!

Thanks for your advice ellipsis!