Bing Liu, a professor at the University of Illinois, Chicago, is one of the founders of GeeYee:
GeeYee is the industry leader in quantifying unstructured text, enabling you to accurately discover and compare a product's or subject's collective features. With our solution, you can drill down to the most granular level, the positive, negative, and neutral opinions on these features, in their entirety, directly from the online source.
(note – all companies are ‘the industry leader’, I never know why people write that stuff).
Bing is well known in the sentiment mining community and has done particularly interesting work in the space of discovering which features of a product attract expressions of opinion. For example, discovering automatically that it is the battery life of the camera which people care about.
I’m trying to find out when the company started (I’ve heard Bing speaking quite recently at a number of events and never heard him mention the company; his website hints at a startup ‘still in stealth mode…’). The domain for geeyee.com was registered in 2006, according to whois. They seem to have a demo up here (id required).