I'm in the process of forecasting revenue for an online business that
will incorporate CPC search advertising into the business model.

To help forecase revenue, I would like to know:
- Average keyword prices broken down by vertical (eg. average keywords
relating to financial services is $5 CPC)
- Average clickthrough rates associated with keywords within verticals
(keywords  relating to financial services has an average clickthrough
rate of 2%)

It would be great if you could supplement the data with the keyword
prices and clickthrough rates from the leading search engines (Google,
Yahoo, Microsoft, etc.)