Contextual marketing - some resources

The following resources are on Contextual Marketing in the subject of Electronic Commerce:

1. Portal on Contextual Marketing: http://contextualmarketing.com/
2. Contextual advertising: http://en.wikipedia.org/wiki/Contextual_advertising
3. Case study: Groupon: http://www.imediaconnection.com/content/28197.asp

Reference
Kenny, D. and Marshall, J.F. (2000) "Contextual Marketing" Harvard Business Review, November-December, 119-125