My experiments seem to show that having seperate IPs definitely helps for inktomi and altavista. I personally see no real effect in google. However, I use them anyway, because when you are dealing with trying to position in the top 20-40 of 50,000 or 100,000 pages, very small advantages can become critical to success.
So it's kinda a "cover your ass" approach. As long as I can get and afford seperate IPs, it seems unwise not to do so.
I think most SE people feel pretty much the same as I do.
Actually, I've been thinking that It might be more beneficial to have domains spread out on more servers, and ignore the IPs. I'll try that before the year is over.
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