A report on ipodnn.com has suggested that advertising revenue from podcasting presents a significant commercial opportunity.
http://www.ipodnn.com/news/05/11/04/podcast.advertising/
The report claims that podcasts could take $1-2 billion from the radio advertising market in three to five years time.
The most important outcome of the ability to include advertising in your podcast is the ability to make podcasting revenue neutral or even positive.
Ciris Business Development would be happy to discuss your podcasting and advertising requirements.
Kindest regards.
Martin