0. Very good choice of colors overall; it has a nice integrated look and a good design.
1. Not every browser yet likes colors specified in the abbreviated format, so you should probably continue to write #336699 instead of #369.
2. .ahem? :D
3. I'm not personally a fan of #dbecf1 ;) I tend to prefer matte colors for broad strokes like background colors. A handy trick to produce such is to specify equal differences between R-G-B, colors like #DDEEFF; alternately, simply vary one of the three, such as #6666FF.
4. I'd increase padding-left on #nav a bit, and use ems instead of px, since your fonts are in ems. Try 1 or 1.5 ems.
5. Do you really need comments like <!--Open header.-->?
6. There is no rule 6!
7. See if you can get your mugshot to have the same left margin as the content paragraph.
I'll just finish by saying as others have that the spartan look is refreshing. Very clean, easy to read.