Keyword research is the basis of success to any blog or site.  Free keyword suggestion tools may be good enough to get us started, but generally they just aren’t good enough.  This article outlines five advanced keyword research tools that are well worth checking out.  You will learn which tools are useful for both SEO and PPC keyword research and analysis, and also which data is helpful in determining how you measure up to competitors for your top keywords.  The comments which follow this blog will also give you some interesting feedback about other tools and experiences that uses have experienced through their use.