A list of the free Amazon Keyword Search Tools and how to use them.
Keyword Shitter – Really lays out a large list of keywords
Soovle – Agood collection of keywords from several services.
Keywords Everywhere – An extension for Chrome and Firefox
Google Suggest – Gives suggested keywords and related searche
Adwords – Use the planner to find what is searched in Google.
How To Find Backend Keywords – Outdated because of the new limits on bites in back end search terms. But a strong point is to search for words related to use.
Keyword Index Checker is in Google Chrome as an addon.
Sonar – A free keyword index checker. Works with AISN and keywords.
Video on how to check indexing using AISN