And this at a conference sponsored by the OU's West Coast division, no less. Luke Ford was there and – unlike Rabbi Adlerstein – has posted audio of Prager's talk, Adlerstein's response, Prager's response, the Q & A, and Prager's closing remarks. Rabbi Adlerstein on CrossCurrents will not even list Prager's challenges to current halakhic practice. He writes:
He cited example after example of halachic areas he thought problematic. I hesitate to publicize on this blog what are essentially blows at the very heart of our mesorah (tradition).
And he does not mention even one of Prager's challenges to current halakhic practice.
Luke also has audio of Rabbi Shlomo Riskin, Rabbi Michael Broyde and others. Unfortunately, his website doesn't allow for linking in the way a blog does. You'll just have to go over there and check it out.
By the way, Prager makes a valid point about Chabad outreach as compared to mitnagdish kiruv. Basically, it boils down to this: Chabad values Jews whether they're frum or not. Mitnagdim value only frum Jews. Largely true. Of course, fame and money are much appreciated by both.