Not meaning to sound pretentious but have you ever tried using google?
Here's the first few results:
http://guitar.about.com/library/weekly/aa082201a.htm
http://eceserv0.ece.wisc.edu/~sethares/alternatetunings/alternatetunings.html
http://www.win.net/mainstring/tunings.html
http://en.wikipedia.org/wiki/Guitar_tuning
