Re: Nuremberg or Leipzig/Dresden?
Nuremberg doesn't have much too offer, but neither do Leipzig or Halle. Dresden is supposedly nice, but haven't made it there myself. Maybe an idea to do the Worms/Heidelberg area on the way back from Munchen.
Anyway, don't plan even spending a day in Frankfurt itself, really nothing to see, maybe just enough to wonder around in the evening if you have to have an early flight or something.
When dividing days between Munchen and Prague, I'd give the advantage to Praag.
Clijsters - Hantuchova - Sprem
Safina - Wickmayer - Dokic
Johansson - Larsson - Arvidsson