Podcasting

I recently attended a podcasting workshop at the University of Saskatchewan for work. My boss would like me to make podcasts about U of S research - students and their research projects, people who have been awarded giant grants, etc. I'm excited to get into this new medium, but I have a lot of variables to consider. What sort of voice personality should I have? How can I spin these to make them interesting? What length should I make them? and on the list goes.

If anyone has any suggestions for me, please do let me know.