Not free which always meant the forum was liable to disappear at any time, no adverts, and part of the domain we have for this Kin (which doesnt cost me anything as I am registered as the domain holder till 2009 at least and is attached to my own personal hosting account).
Themed with a couple of appropriate themes; some good avatar packs included; and will also embed Youtube, Google Video and other video types into your posts from a simple link.
And its more secure than most other forum software.