Esther Dyson, a digerata once named by Forbes magazine as one of the most powerful women in American business, is currently chairman of EDventure Holdings and an active investor / board member in a variety of start-ups worldwide. She sits on the boards of 23andMe, Eventful.com, Meetup, WPP Group and Yandex, among others. Her past investments include del.icio.us and Flickr (acquired by Yahoo!), Medstory (acquired by Microsoft), Brightmail (acquired by Symantec) and Postini (acquired by Google). She blogs for the Huffington Post. Esther became an investor in eCourier.co.uk in 2005.