It almost looks like a site map to me. You know, stripped down, show the info, no frills kind of thing. I feel everything is a little crammed together… There is a fine line between using too much white space and not enough, so play around with it a bit to get a more appealing look. Also, Blue is my favorite color and i love using it in design, however I feel your color scheme is quite plain and nothing really pops out from the white besides the right column, and the little logo. So, if you really like the multiple shades of blue, maybe choose a few darker blues for backgrounds to give it more contrast from the white background.
Just my opinion and 2 cents. On a positive note, its very clean looking and the code is clean. Yay! =)
I think you need to get some background images/color involved, there is too much white space, it would help separate things a bit, maybe a background for your navigation other than white, then another for your sidebar, i would stick to lighter and paler colors though.
I quite like it. Looks clean and tidy, with just the right amount of white space IMHO. One thing to remember is: white space is good but white space doesn’t always have to be white. Maybe try experimenting with light background colours or images to pull the whole design together.