Anything you'd like to add that we missed? 
Huxley: The rise and adoption of services such as Digg, Newsvine and del.icio.us by mainstream content providers over the past year is a huge shift in strategy and an area that marketers are only just beginning to take advantage of. This recent embrace of social media services by the very companies it threatens most is remarkable, and the sooner advertisers figure out how to play in this arena, the better.

Berens: 2006 saw the launch of a number of auction-based online advertising inventory companies, like RightMedia, AdECN and AdBrite that are trying to change the way advertisers buy (and publishers sell) commodity inventory. This parallels some innovative work that eBay is doing with cable television. In an ideal world, these online ad exchanges will free up inventory, empower the bigger ad networks to focus on differentiation and technology and put pressure on the smaller ad networks to define their offerings.

We covered that story at iMedia Connection and I moderated a panel about it at ad:tech New York, and I think that this will be an increasingly important topic in 2007.

Lawson: One of the more significant trends: proliferation of ad networks especially those that serve single vertical industry categories.