Hylighter Document Collaboration Tool

Hylighter
While presenting at the Blackboard World conference in Vegas last week I was introduced to a new Web 2.0 tool for collaborative document review called Hylighter.
One particular thing that impressed me about the product was the way it color coded the document. Not only does it color the document with yellow mine, blue theirs, green ours, but it shows various shades of highlighting that represents that amount of overlap in different sections of review.
Has anyone else had a chance to look at this product?

Please take a look and tell me what you think? I think it has great potential.

You can register an account at http://www.hylighter.com