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glengara - 10:30 am on Aug 29, 2002 (gmt 0)
For what I'd consider a fairly well optimized page, I'm not seeing a huge difference in the results fromGoogle, Fast, Teoma and Inktomi; so I'd also go with the well thought-out "best practices" approach.
I don't see how they can optimize the same page for different SEs without needing to use some form of IP delivery.