This is a nice start, I guess, but.. I would completely redo header and footer, cause now those sections looks empty as hell. Also, you should tweak content section a bit more.
Hello, I am not sure that it will be accepted to PSD category. May be better to try to code it and submit as a ready website template?
Anyway, I think there is something wrong with the header. Background? Its height? May be to get rid of twitter? You have it already on footer (which is very nice) and there it sits well, do you think there is a sense to put it twice?
Try to make navigation box shadow a little bit lighter, it is too heavy to my eye. And shadows for the buttons-icons are too…
Grey strip for mid box (under the slider) needs to be accomplished, it looks unfinished yet.
To be honest, I would not use this layout scheme, it is so overused, but of course, only you decide.
Wish you good luck!
Ah, sorry, you wrote you are working it out for WP, I missed this phrase, that s why I suggested to code it:)))