There are now 106 podcasts listed under the Education section at Podcast Alley
Although the majority of educational podcasts seem to be produced for ICT-savvy teachers about the use of educational technology in education, (it is to be expected), among the shows are a growing number of podcasts aimed at English language learners.
Apart from these, there are others that seem like they could be used with EFL/ESL learners (especially higher level learners. The only problem is finding the time to listen to them to see which ones are worth using. Perhaps there is a need for an ESL/EFL podcast review show about podcasts that can be used with learners?
Perhaps this would be fun to do this summer (yet another project?) although I'm not sure if there'll be time...