Carol Brown from onlinecollege.org has sent me a link to a selection of quotes they have recently published.
The article, "23 Public Speaking Secrets Gleaned from the Greats", contains 23 quotes from successful public speakers on how they approach making a speech. While many debaters may think they know it all or may prefer more detailed training tips there are a few nuggets to at least think about in relation to your speaking style. From "Believe in your message" to "Repeat yourself without sounding repetitive" every debater should find something to contemplate on in the list.
You can find the list at http://www.onlinecollege.org/2011/02/01/23-public-speaking-secrets-gleaned-from-the-greats/)