It’s a good point – alternative sources of keywords like this are crucial to finding the fringes, keywords that are “under the radar,” opportunities your competitors haven’t found. The quick/easy/well-known keyword research tools don’t offer competitive advantages because they’re quick/easy/well-known.

I haven’t done much research via tag clouds myself, but I’ll definitely incorporate it into my methodology. Certainly when looking for a good linkbait topic this tactic will work well. Thanks for sharing.