My blog is at www.vistarewired.com I would especially like you to check out the featured post please since it is very cool. I hope I can get some constructive criticism and advice. THanks.
Keeping the looks of Vista in mind, I think your site is a little too plain below the Header area (the header is good). Spice up the side bars a little. The content is good enough.
I like how you tried to make the site look very vista-like. For the white content area, it looks kind of plain.. I would add very light grey gradients in the background (along the top part of the tables)