I did mean making all the indents bigger.

Hmm. I like the idea of pushing Sent up but I realized what would really me help is the removal of the '---' separation, having Flagged separated from everything and moved to the bottom and, above all, adding a count to Sent so you know there are messages here.

Something like this, I think: http://img692.imageshack.us/img692/2334/91568027.png