This article on the new Samsung “iPhone killer” F700 has this interesting paragraph:

… the F700 offers 7.2 Mbps download capabilities through High Speed Downlink Packet Access (HSDPA) connections. Once the 7.2 Mbps HSDPA network is completely deployed around the country, F700 users will be able to download a 4-MB MP3 song in roughly four seconds, according to Samsung.

Samsung F700

So by my reckoning, a 20Mb podcast would download in about 20 seconds. Radio is DEAD.