Google has just announced at the AdSense blog that they have started a closed beta of AdSense for video.
It will now be possible to put AdSense ads INSIDE streaming videos. So you could host your own video and put an AdSense pre-roll and then another one at the end.
I still haven’t seen it in action but if Google is successful in monetizing video, it could be huge. The economics of video, however, are much different than text so it remains to be seen if the results will actually be worth it.