.net blending effect needs sorting out. Doesn't have enough contrast.
Side gradients are dodgy, not well enough defined and to be honest fairly boring.
Actual text is fairly hard to read, try changing the anti-aliasing settings
Header images appear to dark, a bit brighter would be good.
The fact that the background of the site and the wrap content are similar colours make it look a bit bland.
Overall the design needs to be made brighter, more contrasted and generally more interesting.
There you asked for improvements, can't complain if you don't like 'em