One good font-related tip: Make comments stand out (dark, bold) rather than fade into the background. Forces me to write better comments, and prevents comment from getting out of sync with the code.
The article inspired me to start tweaking my TextMate settings. I found that making hard coded strings stand out is not helpful to me (I write a fair number of queries).
But I got to tweaking and realized that making comments stand out is amazingly helpful. I completely agree that it makes me want to write more comments and makes commented out code a glaring problem.
