I believe podcasting didn't really catch up in Greece (or Cyprus). I remember 5 years ago some bloggers having their weekly podcast as a side-project, but it ended around there.
Your best bet would be looking for recorded radio shows (which are podcasts in a way).
One I listen to is MyCy Radio's "Usus Norma Loquendi
" which is produced by Armostis, a Greek Cypriot linguist, and he has other linguists as guests, discussing their research in layperson's terms.