Stanford University Communications teacher Matt Abrahams suggests you can reduce the "um"s "er"s and other non-words in your speech, by breathing out after you end your sentences. Since you have no more breath, you have to take a breath, meaning you can't insert an "um" (or other non-word) into your speech. This also puts a small pause in your sentences, presenting you from rushing through your presentation.
Tim Wilson
Professional Speech Coach
Free speaking tips at: http://speakingquicktips.blogspot.com
