Does anyone have a formula or guidelines for predicting AdWord revenue based on the traffic a site is generating?
Do you mean Adsense? If you do mean Adsense then there is no formula because each topic yeilds a different pay per click. If you have a site about mortgages then you will get more per click then one about teddy bears.
I have seen a formula one posted somewhere that you can enter varibles - like traffic, average PPC ad, etc that then extrapolates revenue predictions. I just can't remember where I saw it and didn't bookmark the link.