A few brief words of advice for persons doing gaming related videos and podcasts.
Short intros, then get to the subject at hand.
Stick to the subject.
Use your natural speaking voice.
If you don't have a pleasing speaking voice, get someone to do your broadcast for you or with you.
Try to have new information in your podcast, something more than that found with a casual Google search.
If you're doing a video review? Exploit your medium by having visuals and props. If you're doing a podcast choose a location with good acoustics and a minimum of background noise.
No filler! When you reach the end of your useful information, stop talking!