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First having sid's in published search engine listings can be a huge security/privacy problem.
Secondly because of the way googlebot in particular works, having sid's in your url's can cause what is commonly know as the 'google dance' where googlebot gets trapped in your site causing a huge amount of page hits.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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