I have downloaded some podcasts for improving English. These are TEDTalks, 6 Minute English, Hello Internet, More or less: Behind the Stats, In Our Time With Melvyn Bragg. I have not started to listen yet. 

Have you been following any podcasts, which of them do you advice? (Maybe, to say listening is more proper..)

Is it useful for getting advanced level of English? 

Thanks in advance for your comments.