A Deep Voice From Deep Space (washingtonpost.com): You probably heard about this already--the discovery of soundwaves emanating from a huge black hole which "sound" a B-flat that's 57 octaves below a piano's middle C. To actually hear the sound file, go here and scroll down a bit to where it says "video."
And speaking of low sounds, I just found out about a site called contrabass.com, which specializes in all the low instruments, both common and obscure. Fun stuff, including a link to a factory that still makes bass saxophones on a regular basis.
(If you didn't know, I was the bass saxophonist on a Dallas Wind Symphony recording called "Pomp and Pipes" on Reference Recordings under the baton of the amazing Frederick Fennell. Great fun! And playing bass sax did wonders for my bari playing...)