  We discuss the high temperature behaviour of IIB strings in the maximally
symmetric plane wave background, and show that there is a Hagedorn temperature.
We discuss the map between strings in the pp-wave background and the dual
superconformal field theory in the thermal domain. The Hagedorn bound describes
a curve in the R-charge chemical potential versus temperature phase diagram of
the dual Yang-Mills theory and the theory manifestly exists on both sides.
Using a recent observation of Brower, Lowe, and Tan, we update our earlier
calculation to reflect that the pp-wave string exists on both sides of the
Hagedorn bound as well.
