http://zelmanov.ptep-online.com/ctan/symbols.pdf
nicely organized. but probably not suitable for printing.
http://www.math.harvard.edu/texman/node21.html a nice selection of
symbols, but its in html so...
http://www.math.boun.edu.tr/instructors/gurel/symbols-a4.pdf 75 pages
worth. very comprehensive, but that makes it hard to find the most
commonly used symbols.
ftp://ftp.ams.org/pub/tex/doc/amsmath/short-math-guide.pdf has more than
you need, but nicely oreganized. 17 pages.
find your favorite; google 'amstex symbols'