I don't have anything wildly new to add, but I'm part of a podcast hosting site (http://Castmate.fm) and we've seen this bigtime, it's crazy.

We host some high-traffic podcasts with a huge range of listeners, and I've gone through the logs and regularily see stuff like NUMEROUS listeners making 4000+ http requests in 30 minutes, all the 206 calls everyone here is reporting, it's just nuts, so bizarre.

I feel terrible for all the people getting hit with overages, it's so gross. I did some gorilla math the other day and feel pretty confident that this has boosted our network usage by ~25%, I should have narrowed it down to just the affected iOS 6.0 devices, must be astronomical.