I have just posted a new podcast, a video podcast this time on Spondicious Photography. This one is about dealing with open paths in Illustrator so that the images I send in don't get rejected by the micro stock photograpy sites for this technical problem. The previous podcast was an interview with a Australian guy living in Argentina off his micro stock photography business. He says how great it is to have a non location specific income, so that he can live where he wants to.
Although I just sell my photos and illustrations right now I have bought a video camera and intend to get going in that direction too. One site also will sell Flash and audio files for you.
I have to tell you that the income is proportional to your skill with creating photos that sell and the size of your portfolio, but if you are patient then there is income available. Good luck