It seems like everyone and his second cousin has an online advertising forecast these days. We're working on ours, expanding it to include more categories this year. But here's a nice write-up by Chris Sherman of the recent SEMPO survey that has lots of juicy data about search marketing. The organization offers figures for 2005 ($5.75 billion spent in U.S. and Canadian markets) and a forecast for 2010 ($11 billion).
I'll be putting together a "forecast roundup" for this week's Local Media Journal.