Zenith Optimedia Group has revised it’s global ad spending outlook and now predicts the Internet will overtake worldwide outdoor ad spending next year, and will catch up with radio (which will have a 7.9% share, down from 8.5% in 2005) in 2008.

If you’re a radio station manager, you a) do not believe this forecast for one minute; b) think it might be true but have no clue what to do about it; c) don’t care if it’s true or not because you plan to retire in a couple of years anyway. [Radio Business Report]