It looks good. Especially the header. I'd consider maybe getting a custom logo as well as putting a bit more padding on the main content. Either way you're off to a great start!
Hi mate, The site looks quite simple, why don´t you try to do one using Joomla or something like that, I´ve done mine using it and its quite simple to build (CSS, modules...etc), you can have a look: You also need to add more links to your site to make it more atractive and maybe some flash applications. Good start anyway.
I think you are using wordpress. You might want to download some of the nicer wordpress theme rather than using the default wordpress theme. Hope it helps. Cheers! Patrick