I like the top nav bar across all your sites. It makes it easier to navigate between them, I think.
It looks good from here. Very readable. I especially like the sidebar put into another color to separate it a little.
I frequently tinker with my layout in much the same way that some people like to tinker with their cars–just to play and learn. Sometimes it’s as fun a part of blogging for me as the writing. Perhaps you’ve inspired me to think a bit about readability some more.