Thanks to David Berkowitz, I came across this nice summary of the major trends in online media and search in 2008.  The presentation is data heavy but pretty useful.  The following really caught my attention:

• Google continued to grow their Share of Search, up 8 points to 68% market share.  And their “searchers” had the highest rate of loyalty, making this market share growth even scarier to competition.
• Social Media dominated the Top 1000 media sites in terms of Page Views and Share of Time.