For those working on this project I have a short list of some other podcasts I follow to help give you some perspective on where to head with this.  Podcasts are, as I have said, no more than a speech you record.  How informal or fun you make it is up to you.  The important thing is that you communicate your ideas to your audience.  That said, here are a few to give you an idea of some that I like to listen to:

This Week in Tech:  http://www.twit.tv/  This is a fun round table of tech nerds talking about the latest news.  I consider this one of the best, yet casual, podcasts out there.

 Blueshift:  http://astrophysics.gsfc.nasa.gov/outreach/podcast/episodes.html  A less updated podcast this is a great example of a podcast that tries to be informative and fun at the same time.

Galatica Watercooler:  http://www.galacticawatercooler.com/  A podcast for fans of the show Battlestar Galactica, this is a good example of 3 friends sitting down and recording a podcast because they like a given topic enough to babble about it.

Treks in Sci Fi:  www.treksf.com  This is another fan cast put out by a single person and a good example of how much can be done with a little planning and a lot of dedication.  Rico puts out a new episode every week reviewing an episode of one of the many Star Trek serieses.

If you have any questions, concerns or thoughts, please see me for help.

– Mr. O