I have to agree with Mike. The interface is a nice GUI, but it gets a little "in the way" for me. I just removed the things about it that took up space, needlessly. If you take a look at the Sonoris Mastering Compressor, or Mastering EQ, you can (after using them) appreciate a nice, clean interface, where eye-candy is not the priority. Functionality is paramount.
Something to consider for touch-screen users, is to give them the option of using screensets, or the ability to scroll around a huge board where the tracks are at the top, and the mixer is at the bottom, for example. This of using a large SSL or Neve console. Even if you only had a monitor's view of it (small section), you could quickly scroll to another part of it.
What I'd like to see is the Flight Simulator graphics artists meet the DAW makers and give me a cockpit DAW!