I've known about UBU Web for a while now, but only recently, thanks to their podcasts have I really begun exploring what they have. UBU collects texts and audio from a variety of avant-garde artists, all of which are available for free. Some recent things that I found:
So much good stuff, so little time...
Brian Joseph Davis, "10 Banned Albums Burned and then Played" Pretty much what the title describes.
Experimental poet Charles Bernstein counting from 1 to 100 Pretty much what the title describes, although it's quite dramatic.
Komar and Melamed, most wanted and unwanted songs I love, love, love these.
Chieko Shiomi, "Disappearing music for face" One of the original Fluxus films.
Kelly Mark, "I really should" A list of things she should do.
So much good stuff, so little time...