An interesting BusinessWeek article, covers the next holly grail in marketing. Yeap you guest it; those 2 or so inches of screen real estate in your pocket; the cell phone or mobile handset. And more importantly, the application of the analysis of personal profiles and activity streams, for the delivery of relevant/customized information:
As more consumers browse the Web on their cell phones, the No. 1 search engine must cope with less space to place ads
See The Real Threat to Google (BusinessWeek).
Related to this see Andreas Weigend on the Consumer Data Revolution.