Day[9] gives some insightful and useful commentary for how mid-level players can improve their game. I learned a lot from this, and I applied some of what I learned in the first game I played, and I noticed a tremendous difference.
I hope it helps you out too!
http://day9tv.blip.tv/file/3651794/
I hope it helps you out too!
http://day9tv.blip.tv/file/3651794/