This study compares the radio news broadcasts of numerous radio stations (CBS, CNN, AP, NPR, VoA, BBC) to find the differences between the different modes of station operations.  Commercial and public stations were found to miss certain international news items

This June 19, 1998 Wall Street Journal article by Joanne Kaufman discusses a supposed American radio drama renaissance, with quick three to five minute blurbs interspersed in commercial radio.  Mr. Gonshack explains the shortcomings of NPR drama broadcasts as well as the advantages of the shorter format.