Another reason I'm replying is to mention that a lot of people (especially us older types) still use 800x600 (or 640x480) because of our older eyes.
Good point. I'm usually able to ease my eyes on a high res display by making the fonts larger, and configuring the window manager to use larger features. I end up with a much nicer looking display with smoother fonts etc. I haven't run ardour since reading this thread, but it does seem a bit odd that it has such a large minimum size. If people want to run 640x480 and scroll around to find the different parts of the program, I guess they ought to be able to do that.