ClickZ: The Return of the Ad Network

The ad network is back in style, especially as newly popular forms of targeting require the amalgamation of media from many different sources. ClickZ put together a very nice review of the various options, complete with an overview chart. Many existing players are dribbling out announcements about introducing new forms of targeting, such as 24/7 Real Media's upcoming behavioral features to bow next month and BlueLithium's contextual capabilities to be announced next week.