SaddeGeet redesign

This past weekend I spent a few days redesigning SaddeGeet.com. I had some excellent help from my wife who helped me pick out a nice new color theme. When you get a chance; check it out. By the way; I hate having to keep checking 3 different web browsers (IE6, IE7, Firefox) to make sure that my website looks good in all. Its a real big pain in the a$$. Why is html/css so different on all these browsers? Can I blame Microsoft??