i would say in terms of the design of the home page, my eye just doesn't know where to go. the use of black gives a heavy feel to the page, and "Recent blog posts" gets totally lost where it's currently located.

the combination of the "featured content box" rotating/sliding off to the left and the twitter box sliding downward gives me a touch of motion sickness. (pardon my inept terminology)

i like the Collections by Subjects categories, but maybe instead of the expandable lists, have a separate page for each, with the ability to search across all collections within that category?