I've put together 14 high-quality original podsafe instrumental tunes from my Penmachine Podcast into a CD album you can buy. It also includes a bonus data DVD with a bunch of cool stuff that isn't on this website. Find out more...
Some interesting (but far from definitive yet) preliminary statistics from researcher Peter Chen at Monash University, who started a podcaster and videoblogger survey a few months ago.
UPDATE: Mack Male wonders what the margin of error on this study might be. I'm not sure you could have a margin of error, since it's not a random sample of podcasters, and can't be considered statistically representative. Here's a classic example of why.