I talked to Brian about this. I don't like the shift up when the saved message goes away, but we both think it is the lesser of the 2 evils (the other evil being having both the "you saved!" and "you need to save!" messages up at the same time.

Brian is going to put something on the backlog to find a more elegant solution. Perhaps "you saved!" should auto-dismiss, or it should show up at the bottom of the page instead of the top to avoid shifting.