The paid search customer is one worthy study in your average Multichannel Forensics project (book, study).
Most customers understand the difference between paid search and natural search, implying that the customer is using paid search for reasons different than the customer using natural search.
Customers can be segmented by the micro-channel they use (Google Paid Search, Yahoo! Paid Search, MSN Paid Search, Ask.com, etc.).
When search is viewed from the Multichannel Forensics standpoint, you often see that Google is in "Isolation Mode", while Yahoo! and MSN are in "Equilibrium Mode". In other words, the Google customer stays with Google, while the Yahoo! and MSN customer is willing to try all search engines.
Pay close attention to the long-term dynamics of this relationship, if you experience this phenomenon. If the Google customer is less valuable, long-term, and your MSN and Yahoo! customers are switching to Google, uh oh.
Our focus will continue to shift away from traditional direct marketing, to the relationships exhibited by online micro-channels. Our databases will be able to store complex micro-channel interactions across time, allowing us to see these trends.