I just ran across an interesting article on voiceover tips… complete with embedded audio examples of course… I’d say I agree with most of what the author suggests. Here’s one I don’t:

Practice your voice-over technique and don’t be afraid to sound a little weird and “over the top”- everyone does it.

No… no… a thousand times no! Well, the practice part is fine… but the over the top technique is not. If you want to sound like a whacky morning DJ, follow that advice. If you want a professional sound, just be yourself. Slow down and have fun. Never worry about making a mistake… that’s what post production is for!