Yes, there is blank space to the right when viewing with firefox, you could align it to the centre so that it is even which would look better.
Also the image that is maybe E-Spec package? eitehr way the top left image for the first plan is split in 2 also. Along with a few errors in the tables on main content area also.
Now to IE for a review.
The section just below domain sales and above server info and lates news should have an additional break or two in there to psace it a little better, and also the right hand table which shows testimonials and login needs to be a little further right from the centre content as currently it looks a little cluttered, this could be fixed easily by a little more spacing
The design in itself is good, I like the textured background, still bright, yet not white.
I note that your design is in html? yet the links goto a php site, good luck converting yoru design to html, also I dont what you plan for this site/design however if you plan to launch this site you should change teh design on the other pages (domain sales, reselller hosting and shared hostign etc etc) to the same design as that link/the main page.
Hope this helps