I was quoted in an article on CheatSheet.com about the 11 words you should never say if you want credibility.
Here is an excerpt:
Uh, um, like
Filler words like these make you sound dumb and kill your credibility in seconds. Who can concentrate on your accomplishments if all they’re hearing is, “Then, um … I, like, saved the company, uh, I’d say $10,000 in return fees.”
Prepare what you’re going to say ahead of time, and speak in shorter sentences. It will help prevent using these words more than necessary. Steven D. Cohen of the Harvard Extension School says we’ve been conditioned to speak when spoken to. Thus, we feel the need to respond right away. He suggests we take a moment to pause and collect our thoughts before attempting an answer.