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Among those is a "revenue per visit", which basically indicates how much was purchased on average per referral.
The interesting thing is that some, such as Google, Yahoo shopping, and MSN are fairly high - in the 65 cent to $2 range.
Others, like Ask Jeeves and Ask.com, are abysmal - in the 2 to 5 cent range.
Yet, in many cases they are using the same search results and/or sponsored links.
My theory (feel free to flame it!) is that users of sites like Ask Jeeves tend to be younger and/or less net savvy and either have no money, or are afraid to spend money online.