OK, I did not see any discussion about whether the comma is necessary after the e.g. I've had a long-standing argument about this with my boss (I am a technical writer). I prefer it without the comma ("e.g."), but he says the comma should be used ("e.g.,"). I think the comma makes it look clunky and busy. I've seen at least one quasi-official grammar source that says that the comma is preferred but still optional. Any thoughts?