DaveN reports over at Search Engine Watch forums that he is beta testing Mirago’s contextual product. Mirago’s Context Stream looks very similar to Google's AdSense, Yahoo!'s reported Y!Sense and even Kanoodle's BrightAds.
Jenstar comments in the thread that "It will be interesting to see if they offer it to publishers outside of the UK, because their site does appear to have products available to US-based sites as well." In addition, she also notices the "tried-and-true ad unit format that AdSense made famous." Jenstar posts screen captures of the ad at her blog, Jensense, under the entry name First sighting of Mirago's Context Stream.