Search engine marketing spend in North America totaled $9.45 billion in 2006 – the bulk of it for paid search advertising, writes MediaPost, citing data from the Search Engine Marketing Professional Organization’s “The State of Search Engine Marketing 2006″ report.

Paid search spending, mainly for pay-per-click advertising, totaled approximately $8 billion, or 86 percent of search marketing spend, according to SEMPO. Spending on organic search – search engine optimization – totaled $1.1 billion, or 12 percent of spend.

So how much of this traffic went through ppc on direct domains? Any guesses?

[via Sempo]