Whats missing from podcasting? Why hasn't the market grown larger?
CyberFonic: Listening to podcasts takes too long.  I can speed read articles and skip the boring bits.  Podcasts are too linear.  I have even tried playing back at 150% speed, but even that takes too long.  Another problem with podcasts is that they are produced by people who can't say things succinctly and in a very interesting way.  They seem to mostly like to hear their own voices.  What we need is really clever comedians write and produce the stuff.  Then it might be entertaining and informative enough to make me tune away from the radio jocks.