Some Goods Links on the above Subject
http://www.mudgala.com/articles/grantha.html
http://www.ancientscripts.com/grantha.html
http://dsal.uchicago.edu/digbooks/digpager.html?BOOKID=PK419.V468_1983&object=1
http://www.ambaa.org/pdf/index.html
en.wikipedia.org/wiki/Grantha_script
http://www.mudgala.com/articles
http://www.ancientscripts.com
http://dsal.uchicago.edu
http://www.ambaa.org/pdf/index
en.wikipedia.org/wiki/Grantha_script