Posts, Pictures, and Pointless Ephemera
you're always safe if you use one whenever you have to take a breath even if it's at the very, end.
Get the new edition of The Elements of Style, swankily illustrated by Maira Kalman. It's got commas covered.
Ooh, swanky indeed! (I love her stuff - What Pete Ate is one of my favorite children's books). I'll have to pick up a copy ASAP