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But you've got to balance this against the fact that being #1 results in more gross traffic.
In my experience that is absolutely not true. The higher you are the more vulnerable you are to "curiosity clicks", and fraud.
I'm one of the people who will swear that positions 3-4-5 (or even lower) are more cost-effective, in any PPC search engine.
I'm removing Overture from my mix, though, because of their collaboration with Gator.
For informational clicks, slightly higher visibility, second tier keywords, and looking for returning visitors as much as initial sales, then positions 3-7 seem to have the best ROI.
Obviousally a good description is essential, which is sometimes difficult with Overture's editing methods, but if you can manage one, I would suggest always staying in the #3 position for major keywords/sales words, and 3-5 for information words.
eWhisper