Real-time email marketing company Movable Ink recently launched a service that could dynamically change emails after they have been sent out. The technology can change emails based on time of open, recipient’s current location, social cues, fast-moving inventory, and more, and works across all email clients (Gmail, Outlook, iPhone, Yahoo, etc.)
http://techcrunch.com/2011/11/10/movable-ink-launches-service-to-stream-live-content-in-emails/