The hostile bid for Yahoo by Microsoft proves one thing: search is prehistoric. Click here to tell me whether you think search is prehistoric. How much greater is the ROI (define)? When specific travel deals were dynamically inserted, the CTR...
Both of these seem fairly prehistoric to us now. Life is pretty simple and grand in the SEO (define) world right now. Another factor will be what you tell the search engine algorithm (define) indirectly through your click actions and behaviors.
If you need further proof meaningful metrics are needed, look at the results of Southwest Airlines Ding, a successful, albeit prehistoric, version of a 2.0 widget. But in this industry, which continues to be plagued with link exchange schemes, paid...