The header and the layout is good, navigation is simple. I didn't like the color combinations though. Try some other combinations. I would also suggest you to increase the font size of the content a bit to be clearly readable.
the header can be improved. i thought that the current image was a rack of servers :p ( i must get out more )
also the menu images on the left should be dealt with. cos they dont look the same. they have different effects applied to them. also make the spacing between menu's consistent
in the right side there is a spelling mistake in "If you're green thumb" it should be your