The link goes to the version you can pay to download but note that you have several options to hear this including live radio today!

The play will air 7-9 pm Pacific today on live radio - online at www.kpfk.org/ and on radio in southern California (KPFK 90.7 FM in Los Angeles, 98.7 FM in Santa Barbara, 99.5 FM in Ridgecrest/China Lake, 93.7 FM in Rancho Bernardo/North San Diego). It will also be available for streaming online through December 1 (presumably after the live version has aired).

I think I got nine writers, who are all scattered to the winds in Los Angeles, all show runners, executive producing television shows. They’re all very powerful. But I got them when they were all poor, hungry and in the same room together, working on scripts. And I think it’s amazing that Joss found that much undiscovered talent and got them all in the same room. And I definitely benefited from that. I really feel that I stood on tape, where they told me, got the lines right, and they made me look very good.
James Marsters talks Buffy (X)