oneDrum – Real Time Collaboration for Microsoft Office
http://onedrum.com/

oneDrum is a desktop application that allows users to share and work on documents together, inside their favorite applications – such as MS Office. Specifically oneDrum allows users to: a) share and synchronize files between each others’ machines; b) author documents at the same time, seeing each others changes as they are made; and c) communicate more effectively about your shared documents with in-document chat, simple project management, and notifications that tell you what other authors are doing. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.