I am quite happy to have received an invite to the Yahoo! | Bing network contextual ads (powered by media.net). I just migrated my websites to use these ads.
I don’t have yet information regarding the profitability of this network, I should be able to come back with some numbers in a couple of weeks (or month given the frequency of my posts on this blog J).
Setting up ads is super easy, if you are already familiar with AdSense, it should not be a problem at all. Setup your ad unit, copy the code to your website, and start getting paid.
If you are looking for an invite, this is the way: http://contextualads.yahoo.net/