Alexej Jerschow's Interactive NMR Frequency Map Very useful resource. You enter the proton Frequency, the range you want to see, and the spin. The table prints out a very handy chart of the receptivety of the different nuclei. http://www.nyu.edu/cgi-bin/cgiwrap/aj39/NMRmap.cgi
NMR Periodic Table From Bruker's NMR guide and encyclopedia. Very useful and complete. All NMR active nuclei are listed. Including commonly accepted references. http://www.bruker.de/guide/eNMR/chem/NMRnuclei.html
WebElements This is the home page of WebElements, the periodic table of the elements. It has NMR data toward the bottom left of each element page. http://www.webelements.com/
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