Today has me thinking on the subject of measuring keyword performance. I'm about to begin a relatively large scale campaign on both the organic and PPC side for a client and have wrestled with the neccessary facts and figures to track in order to have reasonable metrics. Here's a short list I've composed:

1. Searches per Month - From Overture & WordTracker
2. Daily Click-Throughs in Position 1 at Google & with Overture
3. Conversion Rate per Term
4. Visit Length per Term
5. Avg # of Page Views per Visitor for Given Term
6. Avg Sale per Conversion
7. ROI Rate for Term
8. Historical/Seasonal Fluctuation of Above Numbers

I'll probably be adding metrics to track all the time, but at least with these as a starting point, I can attempt a coherent report to make sense of the data. I'm looking forward to starting a new campaign from the ground up, as maintenance and innovation have been in the driving seat over the last year.