Changed the main body text to black. I can understand why this may be undesirable to some, but having high contrast to make it easier to read is more important to me.
Changed the font style on the code areas (pre) to use Inconsolata font which is grabbed from google fonts.
Changed the backgounds on the coding areas to not use alpha, and the inline code snippets also have the background shaded. Not disabling the alpha would result in two layers of alpha stacking.
I have enabled google+ comments.