Naropa University runs a great online audio archive, as a way of
'preserving and providing access to over 3500 recordings made at Naropa University since 1974. The collection was developed under the auspices of the Jack Kerouac School of Disembodied Poetics (the name of the universityís Department of Writing and Poetics) founded by poets Anne Waldman and Allen Ginsberg and contains readings, lectures, seminars, panels and workshops from a constellation of artists who aim at restoring the poetís ancient role as keeper of the culture and social commentator.'
You can probably imagine the veritable treasure trove of material that's now freely accessible thanks to this wonderful project... and if not, just wander around the site a bit to be thoroughly wowed.
Needless to say, the curators are constantly adding recordings, and I highly recommend subscribing to their RSS feed to be automatically notified of new additions.
A place to start could be this 1999 Peter Lamborn Wilson lecture, in which he clearly and forcefully makes his controversial case against drug legalization. Here's the article to go with it.
Next, you might wanna check out this 1984 writing class led by Allen Ginsberg and William S. Burroughs in which, among other points of interest, Burroughs goes into his idea of "Life as a Cut-Up" in some detail.
Just two examples. Now go and splurge.