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CovertSEO - 11:50 am on Dec 10, 2011 (gmt 0)
I have done the same thing several times and been reward. Sites that has keywords filled like anything are coming on top and if i change my old title to something sensible then i don't think Google will consider it as "black hat seo" and will penalize.. come on guys.. i have done that and gained good results.
And yes, I did it to affect rankings.