i will be sure to write a full update on my completion of the marathon tomorrow, however... here's an article that pretty much sums up my state post the 13 mile marker: http://www.sportsinjurybulletin.com/archive/marathon-cramp.htm. also, an article about prevention and sodium recovery is at: http://www.gssiweb.com/mp3/sodium_recovery.pdf.
not to worry, j. and i definitely finished the 26.2! next time though, i'll be better prepared!