Same thing as c0rr0sive was saying and Baez and my replies apply here as well. it is your monitor/browser width causing the overlap. But, as Baez said, the banner(s) will be switched out on a semi-regular basis. We are looking at maybe having some banner design contests so members can help create new ones along the way.
I love it!! Baez, you've got some serious talent! Everyone, he deserves massive rep for this. No doubt the time and effort put in was enormous. Especially when you get the templates changed on you