Well, the first thing that really caught me was that your site is not Mozilla friendly. It looks fine in Internet Explorer 6 and 7, Maxthon 2, and Opera 9, but it breaks in Firefox 2 and Netscape 9 - neither the black border around the content or the background image appear, the navigation area background disappears (though the buttons still retain their backgrounds) and the sidebars (such as the "Why Choose CDM" box on the main page) jump so far down to the bottom that you need to scroll down to see it. The backgrounds and black borders also break on the Client References page when viewing in Opera. That's not good.
The link to your Privacy Policy is broken on the Welcome, About Us, Services, Individual Services, Business Services, and Contact Us pages, as well as on the Privacy Policy page itself (it works fine on the FAQ and Client References pages).
Also, it doesn't validate - 11 errors.
However, that's nothing a little clean-up shouldn't fix. Visually, it's not too bad - like jflynn said, I'd clean cut out the black border, and centre the page. I like the links where they are though - I think they fit the feel.
I'd remove some of the space between the navigation bar and the content - the gap is a bit large. I'd also use a different font for section headers (i.e. "Welcome) - right now it looks a little out of place with your main header. I'd use maybe a size smaller, or possibly your regular font but bold - just so it's not quite that big. I might play with the font a little to - consider a smaller overall font (not font size, necessarily, I'm thinking actual font). I think it would make it looker a little cleaner and more professional (again, more fitting with your header image).
That's pretty much it - like I said, some minor fixes and clean-ups to get the code valid, a little tweaking so it's cross-browser compatible, and a few minor visual alterations (font-touch ups, centre the page), and it'll be great. It's certainly off to a good start - it feels very professional, in my humble opinion. Good work!
-Patrick J. B. Simmons | @hobbramble
"If I could give you one piece of advice to remember for the rest of your life, it would be this: when Patrick tells you to do something, do the opposite." - Nolan Ladewski