How do you discover Long Tail keyword phrases for your own site?

Most of the mainstream keyword research tools such as the free Google external keyword tool, Wordtracker, Keyword Discovery, Keywords Analyzer, and Wordze are a good place to start, but you also have to find some other not so obvious ways to search for Long Tail keywords. The SEOdigger.com keyword spying tool is definitely a must have tool. You can also try Google suggest. This free Google tool tries to guess what your searching for and gives you suggestions in the form of an auto-complete search box.
Another great way to discover Long Tail keywords is to collect site search query data directly from your visitors. A site search tool consists of a web form and a small database of all the site URLs and their content. When the user types a query into the search box the program saves the query in the database. This is a true gold mine of Long Tail keyword phrases coming directly from your website visitors. We have been using the Zoom Site Indexer, a very inexpensive MS Windows based site indexing and search tool on our own site and several SEO client sites, it works really well.

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