Ashu Garg's recent post entitled "Data Liquidity" brings light to the growing data exchange model including data traders, BlueKai, and yield optimizers, AdMeld, who have absorbed millions in cash from venture firms this year.
Mike On Ads is looking for rumors on what's going on with Google's display advertising strategy.
OK, this post was from November, but check out Greg Linden's post on wacky research from Yahoo! on not advertising.
Anil Batra is hosting a poll on whether or not you would pay $1 per month to have advertising taken off your favorite website. (Keep that advertising running - it's beautiful, isn't it?)