1. Given there was a time when expansion was decelerating, and now its accelerating, that sounds like something thrown up, falling down.
2. Looking at 7 billion year old light and working out what was happening then, an acceleration of expansion, begs the question "where are those galaxies now?"
"the 2009 Royal Society of New ZealandDistinguished Speaker"
- index page for November 2009 Royal Society Lecture (view on Google Sidewiki)