[2008-11-13] SEM Rush Search Marketing Research Review A new competitive research tool by the name SEMRush is being beta tested, backed by the same programmers who created SEO Digger. SEM Rush can be seen as a deeper extension of the SEO Digger project (adding PPC data and tracking AdWords keywords), and a competitor to services like SpyFu (which recently launched SpyFu Kombat) and Compete.com.
