http://www.longtailvideo.com/addons/...ail-AdSolution
Be warned, I have a client that used that and the T&C stated that JW took 2% of the advertising + the fee he paid for the plugin (it is free now). You actually have to set up the advertising on their side in their manager. Not locally.
He was running endroll ads on a site. When he watched a video and the ad popped up, it was always showing their ad. The way they counted their endroll ad was based on the number of times the video was started, not the number of times the endroll advertisement was displayed. So, with thousands of videos started, but only a fraction showing the endroll ad, JW ended up taking over 80% of the actual ad impressions presented. i.e. 1000 starts, JW said they were owed 20, 24 endroll ads actually served, JW took 20, client got 4. We had expected JW to take 2% of the 24, not 2% of the 1000.
http://flowplayer.org/ uses OpenX
http://flowplayer.org/plugins/advertising/openx.html
which allows postroll ads. The learning curve on OpenX is a bit steep, but, if you've used phpadsnew or openx already, it isn't too terribly bad.