One thing to point out is that even when you successfully remove all sessionhashes... Google spiders still visit with one!
I think their software has learnt vb and just compensates and discards. But this didn't bother me because the lack of sessionhashes and querystrings does help with being cached by proxies (the particularly dumb ones that AOL seem to use). So there is a benefit to it... but not as much as you think there will be.
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