Below are some references for creating good podcasts:

Lisa Williams 4 minutes about podcasting
O’Reilly’s Ten Tips For Improving Your Podcasting
Sound Recording and Editing Tips
Video Podcasting News (A great blog to follow developments in podcasting
Podsafe Music Network (Place to get safe audio for your podcasts)
Tweaking IDE tags (metadata) of mp3 files (IDE Tags enable you to label your audio).
Video Podcasting (Learn all about video podcasting from PodcastingNews).
Pew Report on Podcasting
Measuring Podcasting’s Growth
Using iPodder