IE 1 px out of alignment

[WotNow]

Hi have just finished draft of site boabdesignlandscapes.com.au and all is good in other browsers but of course Internet Explorer is giving me a hard time and all of my divs are 1 px out of alignment. I have been over and over the code and set explicit widths and zeroed out margins and paddings but cant see where the problem lies.

I would reealllly reallly appreciate fresh eyes on this before I go mad! Thanks.