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I've received a few clicks from misspellings.
As far as I can ascertain, for a site to do well for a misspelling (as a result of query expansion [webmasterworld.com], as opposed to using the misspelling or being linked to with it) is unrelated to the usual mechanisms that get a site to perform well. In fact, I frequently see sites that appear to lack any authority or trust perform well for misspelled keywords.
I believe this is related to (the same as?) a similar effect I see on a fair number of UK sites, which perform better on foreign-language Googles for global searches.
I have a puzzle with lots of pieces at the moment though ;)
Maybe it removes some kind of filter or triggers some kind of other change to relevance.
What I don't quite get is why simple query expansion would change relevance - surely the best match for the correctly-spelled word is still the best match? For this reason, I'm not convinced it's a deliberate effect.
I used only article marketing for the SEO providing about 80 links.
The site ranks well for "Widgets City" and lots of variations of that phrase, but at one time it was on the first page for "Widgets" & "Widget".
It only stayed there for about a month but then its ranking dropped to around position 250.
Almost all of the anchor text in the links originally contained the the word "Widgets" and other words one side or the other or both, and I think this is the reason why it was penalised. Since then I've changed most of the links to provide a high level of keyword variation and "Widgets" only appears in about 20% of the links now. I requested reconsideration from Google and the site now ranks high for the word "Widget" but not "Widgets".
If most of your links contain your keyword, that could be the reason. I think what Google looks for is a natural variation of anchor texts.
[edited by: Jubbsy at 9:20 pm (utc) on Jan. 8, 2009]