With any kind of online marketing you need a place to start. Find out what kinds of search queries people are typing into the search box and you’ll know what kind of content to optimize, create and get links to.

For the most part, keyword research software and tools fall into a handful of categories. Paid and free are two as well as those that are specific to SEO or for PPC. There are a few dominant players in each category but with some interesting innovations in the past year or so it’s worth re-visiting what’s out there and which tools our dear Online Marketing Blog readers prefer.