This thread makes me want to see Corbomite again. I'm going to get the DVD out and play it within the next couple of days, despite a backlog of TV on the DVR.
It really is one of the best episodes of the series. It has a lot of special touches and texture for Kirk, something the early first season shows did best (like the scene with McCoy in Kirk's quarters in "Balance of Terror").
Corbomite has good action music, too. "Cube Radiation" is one of the most exciting ST cues ever.