Release news of 2.0.0: "I just released libechonest v2.0.0. The only major change is the upgrading of the Dynamic Playlist API from the old, deprecated v1 to the new dynamic/foo calls. The old API will stop working on developer.echonest.com/v4 on July 27th, 2012, so any users of the dynamic methods should upgrade immediately to libechonest 2.0.0. As the API has changed significantly the 2.0.0 release is not source nor binary compatible, hence a new soversion. Enjoy!"
in portage, feel free to bump this on your own next time if you want