Presence

Just stumbled across a site called BCBM.org (Bergen County Beis Medrash) that has links to mp3s of many of R. Soloveitchik's shiurim (apprently ones from the Nordlict collection). The quality on the few shiurim I sampled was less than ideal, but that's to be expected.

The links for other YU rabbeim are the same as what is found on YUTorah.org.