Here are some of the links I mentioned in the latest show:
http://nutsci.org/2011/03/03/athletes-obey-your-thirst/
http://www.active.com/nutrition/Articles/The_new_rules_of_hydration.htm
http://www.ultrunr.com/noakes.html
http://www.runnersworld.com/article/0,7120,s6-242-302–8785-0,00.html
http://www.uct.ac.za/print/mondaypaper/archives/?id=3713
http://www.usatf.org/news/showRelease.asp?article=/news/releases/2003-04-19-2.xml