Some of these are hilarious
All available on itunes (for free) or if you are a non i-tuner (like me) they have direct links where you can download and listen later
Most of them take 3 or 4 episodes until you "get the vibe", but i am absolutely hooked on these.
PS these ones are all Melbourne based stand up comedians
PPSS they can be VERY adult
good one to start with: (and my fave)http://dumdumclub.libsyn.com/
also hilarious, but can be very wierd as well. Takes some getting used tohttp://forthedrivehome.libsyn.com/
and of course Wil Andersonhttp://tofop.libsyn.com/
Trust me, if you have a decent sense of humour and a very broad mind, these things are dead set hilarious.
There's a few more as well, of a similar ilk. I believe that they prefer you use itunes, if possible.