Did you see this?
http://forum.dopplerradio.net/viewtopic.php?t=223

How many people listen to podcasts? We’ve seen some numbers lately, all from “trusted” sources. They just don’t match. We found a nice summary on Neville Hobson’s weblog:
“Now that Pew Internet’s data on how many people listen to podcasts has been roundly trashed as untrustworthy, would you trust any numbers from anyone else on projected […]

La Cadena SER, a Spanish radio station, wrote an excellent manual on how to add their podcast to Doppler.
“Existen múltiples programas para acceder a servicios de podcasting, como ipodder, doppler, jpodder o ipoder.net. Con todos ellos podrá descargar los programas de la SER y transferirlos a su reproductor MP3, pero para esta guía hemos elegido […]

It’s only a few months ago that almost every article on Doppler and every podcast itself was noteworthy to mention on this site. Every day the number of Doppler users and referrers grows. There’s so many people talking about and using Doppler, that it’s hard to pick one specific story. There’s only one conclusion: podcasting […]