I think it's pretty clean and looks well, the only thing bugging me is "maybe its too simple" but looking at the smaller sizes I'm a bit relieved, at least it's looking as well as when it's big :), something I've been struggling with, I'm not sure if I have more rejections or "won't look good in 16pxls"(according to hurried mods...)
Simple is most of the time better for a logo.