Interesting post on Micropersuasion about another attempt to make podcasting financially viable through advertising. Check out Radiotail here.

Apparently "RadioTail enables advertisers to reach just the precise demographics they want. They allow podcast producers to focus on content while generating income from their efforts thanks to special technology auto inserts rotating ad spots and campaign tracking."

Sounds great, but my fear is that the currently low levels of podcast distribution will make this angle hard to sustain revenue wise. Another, couple of years down the road and it could be a very different situation.