Planleaf – Task Management with eMail
http://www.planleaf.com/

Manage tasks completely over email with anyone, anywhere. Features include: a) Send a simple email; b) Get a tasklist right inside of email; and c) Daily digests of all your tasks. This will be added to the tools section of Research Resources Subject Tracer™ Information Blog. This will be added to Entrepreneurial Resources Subject Tracer™.