I'm sorry, but I really don't have the time, besides giving a few suggestions here on HN. In any case, graphical design is not exactly my main area of expertise. Keep in mind that it's a lot more craft than art, so you can do a lot even if you consider your self graphically challenged.
You might want to present your layout on forrst.com. If you don't know it already, it's a community with the focus of bringing hackers and designers together. You can usually get some good constructive feedback there. If you need an invite, let me know.
You might want to present your layout on forrst.com. If you don't know it already, it's a community with the focus of bringing hackers and designers together. You can usually get some good constructive feedback there. If you need an invite, let me know.