At first glimpse, the site looked a bit crowded with all the borders around the text at the top (refresh, layout, demoset) but that cleared in a few seconds as I took a *good* look at it.
Pretty innovative design, if you ask me. I liked the use of I-Frames with the content.
The only thing I would change is the large refresh image. It was unclear what it was at first, but maybe if you antialias the edges of the arrows, it'll become more clear.
Beyond that, I'd give your site high praise for finding a mostly unused design that I've never seen before!