Ahh... Accesskeys.. After much research over the last few months, I've purposely decided not to implement accesskeys, due to that minefield of cross-browser conflicts involved. Basically, the only accesskeys that won't conflict with any browsers are numbers, but numbers will conflict with JAWS and possibly other assistive technologies. For that reason, they're staying out. I'm instead going to use <link> relationships to create site wide navigation for browsers which take advantage of it. (Gecko, maybe Opera? not sure). I may also include some JS fueled accesskeys to allow IE users to use the <link> nav, but that'll be further down the road.
Third, you have not used any accessibility features, try adding simple things like access keys to allow that extra useability.