SearchEnginePeople.com has put the three-to-one ratio of PR pros to journalists (first noted by ProPublica last month) in graphic form:
From 1997 to 2007 there was a 30% job growth in independent PR, including in-house PR or PR departments in agencies, SE says.

As ProPublica reported in May: "In 1980, there were about .45 PR workers per 100,000 population compared with .36 journalists. In 2008, there were .90 PR people per 100,000 compared to .25 journalists. That's a ratio of more than three-to-one, better equipped, better financed."

More at SearchEnginePeople.com.