I just heard from the AAAA Digital Marketing Committee that the IAB’s Ad Sizes Working Group will be making the first update to the IAB (Interactive Advertising Bureau) Ad Unit Guidelines since their inception. They have voted to add the 300×100 and 720×300 banner sizes to the current list of Interactive Marketing Units. This information will be made public on Tuesday 06/05/07.

The IAB

The current and updated Ad Unit Guidelines can be found here. The site will include information on how the industry can provide feedback on these new sizes.

The Guidelines suggest various units that are being voluntarily introduced or offered by publishers. Agencies should consult publishers to understand their full creative specifications. Also note that the IAB Ad Sizes Working Group will be analyzing data in the soon-to-be launched Creative Spec Database to recommend file weights for each of those units.