Here are links to sweetening podcasts…

Here is a great page that links to a lot of good info on audio recording…

http://audio.tutsplus.com/sessions/

Here are a couple of specific links from that site…

http://audio.tutsplus.com/tutorials/production/how-to-process-vocals-for-podcasts-or-voiceover/

http://audio.tutsplus.com/sessions/recording-vocals/

and here is other stuff.

http://www.designstudioschool.com/your-advice-for-fattening-podcast-audio-vocals-t174577.html

http://forums.creativecow.net/thread/168/857679

http://library.creativecow.net/articles/mcmahon_frank/Audition1.php

http://www.youtube.com/watch?v=NYqQ1lRupHQ

http://www.how-to-podcast-tutorial.com/17-audacity-tutorial.htm

http://www.how-to-podcast-tutorial.com/17-audacity-tutorial.htm