Hello,
I found the small white text hard to read on the green background, rather than reading it I just skipped, it could be worth trying a different font such as verdana.
At the top where you have the logo and menu, they seem to clash with the background design, you need to get the logo inside the curved section, or remove the curved section altogether, it seems jarring, especially the menu over the curve. - this also applies to the footer at the bottom of the page.
For some reason the skin.css file is called in twice, use the web developers toolbar and you can see there are two tabs named skin.css:
Troubleshooting DotNetNuke Skinsyou may have placed a call to the skin.CSS file in your skin HTML file which is not needed, this is worth checking out.
Once you have your site running as you wish, it's worth having a look at Snapsis page blaster module, as it can really help to speed up page loading times.
Thanks,