I've tweaked a few layout things

I've tweaked the design here just a little. The header graphic is back. I got bored with just a big, blue rectangle. We'll see how long I like it this way. Paragraph and post spacing have been adjusted to (I hope) make it easier to read and scan. Also, the titled posts titles are no longer blue. There was too much blue. This makes "blue is a link" inconsistent, but hopefully not troublingly inconsistent.