Spyfu

The great site finds the most important keywords and ad copy from competitors in SEM, which means more statistics for your campaign. About SERP data, everything else.

The SpyFu site reveals the best opportunities for search marketers, search engines and PPC professionals to find the answers they need to stay competitive and grow their business.

SpyFu Classic (Domain and Keyword Information)
SpyFu SEO RECON Files
SpyFu Kombat
Ad History: Keywords and Domains
Keyword SmartSearch
Keyword Groupie
categories