We need more pages in the Theme Preview. Without it, I hardly have a chance to understand how a theme handles navigation, and therefore whether I can use it or not -- because, let's face it, navigation is nearly half the battle. Moreover, I need pages with some variety. Put in a few more photos, some gravatars, some audio bites, and see if the theme breaks. That would save me the half a day I now spend only to find out my new theme choice really doesn't suit me.