They still don't use peer-to-peer sharing. Every now and then Ira Glass will plead with podcast listeners to fund the hundreds of thousands of dollars in bandwidth that This American Life costs. I emailed them once about why they didn't simply send the cost of this down to zero by going peer-to-peer, and they said they'd looked into it (and didn't supply further details).

Possibly there would be problems tracking downloads for sponsors. Or, maybe it's the structure of how pledge drives work, where a breakout show like TAL helps fund the entire station.