Forensics
Extemporaneous Speaking, Lincoln Douglas Debate, Policy Debate, Vendors, Cali's Speech and Debate Ring, Captain Nitro Online, Debate Central, debate.net: Software Area, Debating Tips and Tricks, Great American Think-Off, IMPACT Coalition, Marc's dutch debating guide, Nostrum, On Debating
Advanced Public Speaking Institute
Large collection of free articles on presentation skills, covering both very basic topics and more advanced issues such as audience participation.
Clean the Wax From Your Words
Tips on constructing a good speech.
Effective Speech Writing
Techniques for writing an effective speech, including choosing a theme, including quotes and other resources, effective closings.
So You Wanna Deliver an Effective Speech?
Breezy article goes through the basics of preparing and delivering a speech, with some interesting thoughts on audience and nervousness. Printer-friendly version included.
SpeechTips.com
A short, basic guide to speech writing techniques, from a company that sells special occasion speeches.