Not bad.
A couple of things I'd personally change:
-the buttons in the left navigation. Looks hokey. The text looks out of place and to big for the buttons they are on. Also, try doing something other than beveling the buttons. Any time I see bevels I think "ugh...cheese photoshop filters". Maybe try using some non-antialiased pixel fonts. If you want more info let me know.
-the header on the right side. The header as a whole looks good, but the way it ends on the right side doesn't. Maybe try making the header continue the entire length of the browswer window, or maybe just have it fade into the blue instead of those bars.
Those are the two big issues that I noticed right away. You might also try "spicing" up the content area with some little images for the headers or something.
But yea, overall you're headed in the right direction I think.
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