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the same here about the header, it's to empty, clean style is good but this is to much :).
The charts again to plain, play with the charts a bit more, here is some inspiration:
http://liquisoft.deviantart.com/art/Module-Concept-44296514?q=boost%3Apopular+graph+chart&qo=15
http://www.andreasn.se/blog/images/gnome-timeline-thumb.png
http://www.bookcaseangel.com/images/graph-resume.jpg
You don't need to have contact in 3 different places, take it out from the top right navigation.
And you need a footer.
For the header I uploaded a photo, take a look.

Like the overall layout simplistic and clean and easy to look at not so hard to find thing. I don't like the logo though and I agree the header looks to empty. would like to se more interaction of the logo within the rest of the website.
Check out:http://justcreativedesign.com/2009/07/27/what-makes-a-good-logo/ http://logopond.com/