Forrester Research now estimates that search marketing accounts for 39% of all online advertising spending and is expected to account for 44% of online advertising spending by 2010. That means that over a third of all advertising on the Web is currently related to search. To break it down even further, here’s where those search related dollars are going:

Paid Search Ads (PPC) – 51%
PPC Management Fees – 12%
Organic Optimization Fees – 11%
Other – 11%
Contextual Ads (PPC) – 10%
Paid Inclusion – 6%

Search Engine Marketing (SEM), Search Engine Optimization (SEO) and Pay-Per-Click Advertising (PPC.)