When you practice public speaking your skills increase automatically.
http://www.angelfire.com/ab/speakers/index.html
http://www.toastmasters.org/
http://www.abacon.com/pubspeak/index.html
http://www.ukans.edu/cwis/units/coms2/vpa/vpa.htm
http://www.speakeazy.net/
http://www.stresscure.com/jobstress/speak.html
http://www.buildingyourself.com/index.html
http://www.hku.hk/pdcc/course9.html
http://www.la.psu.edu/speech/100a/
http://www.angelfire.com/ab/speakers/index.html
http://www.epinions.com/book-Language_Arts-Public_Speaking
http://www.usps.gov/
http://www.abacon.com/pubspeak/
http://www.citizen.org/
http://www.ukans.edu/cwis/units/coms2/vpa/vpa.htm
http://www.stresscure.com/jobstress/speak.html
http://www.toastmasters.org/tips.htm
http://www.la.psu.edu/speech/100a/
http://www.mpt.org/
http://www.arrl.org/pio/pr.html
http://www2.arrl.org/pio/pr.html
http://www.casaa-resources.net/resources/sourcebook/acquiring-leadership-skills/public-speaking.html
http://www.tpag.com/
http://avenue.tutics.tut.ac.jp/pubdict/pubdict.html
http://www.gnu.org/copyleft/copyleft.html