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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
I hope that works for +1 button clicks as well! Makes sense though if it truly does just reflect popular search behavior. Sometimes I think it would be better to perform keyword research on auto-complete over the finicky and inaccurate Google KW tool.
You mentioned you did not want to use one provided by search engines.
This is by far the best list of both web-based and server side sitemap tools I have found to date,
http://code.google.com/p/sitemap-generators/wiki/SitemapGenerators