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I find WT better for finding 'real world' search queries. It gathers its data from a couple of meta-engines, like dogpile and mamma (don't quote me on those being the actual sources), and they don't affect the data in any way, unlike OV. afaik, OV concatenates plurals and 'match-driver' equivalents into a single term. WT even lists capitalization differences.
anyway, given all that, WT's site has been weird recently, and today I cannot get to it at all. :(
You do need to just use these online tools to get an idea of the number of people searching for your keywords and phrases.
SEOs running keyword tests on Yahoo & MSN, plus other engines can soon bump up the Overture stats.