Let the people below tell you what public speaking has done for them.
http://www.toastmasters.org/tips.htm
http://www.la.psu.edu/speech/100a/workbook/wrkbk.htm
http://www.la.psu.edu/speech/100a/
http://www.speechtips.com/
http://www.speakersquest.com/
http://www.work911.com/conflict/speak.htm
http://www.ukans.edu/cwis/units/coms2/vpa/vpa.htm
http://www.selfgrowth.com/public.html
http://edb518ea.edb.utexas.edu/html/LatinAmerica.html
http://www.performanceanxiety.com/
http://public-speaking.secretscourse.com/
http://www.cybernetik.com.au/
http://www.tpag.com/
http://www.leadershipinstitute.org/training/public_speaking/public_speaking.html
http://www.publicspeaking.com.au/
http://www.eeicommunications.com/eye/shyness.html
http://www.lossforwords.com/
http://www.oreilly.com/frank/
http://www.edinboro.edu/cwis/acaff/suppserv/tips/CAT20.html
http://avenue.tutics.tut.ac.jp/pubdict/pubdict.html
http://www.freenet.edmonton.ab.ca/toast/tips.html
http://www.speakingcircles.com/
http://www.esu.org/educate/centre/index.html