Yup. Same here - I want to see where I can fly cheaply. More importantly, however, is that it is not just domestic - but international as well.
If there was a way you could then convert that into some kind of cost per mile figure, you would make me very, very happy!
To be honest, I was happiest with the old EaasySabre interface where you had the flights and the seats available in each bucket, all available in a nice easy command line. Not too complicated a whole search system - just enough to let me find what I want quickly.
It would also be nice to have not just seat charts, but a list like SeatGuru which gives you an idea how much room you get with each class of seating.