While I don't see podcasts as a type of blogging, there's a fair number of people out there that don't see the difference between a podcast and an audio blog.
Regardless of what side of that fence you're on, Aaron does a good job of discussing the pros and cons of what a podcast can do for an established blog.
I won't spoil it for you, but in essence Aaron feels that the pros include:
- Hitting 'on the go' consumers
- As a supplemental resource
- Great for interviews