http://www.centraldesktop.com/
Simplify How You Collaborate With Others
Create online workspaces to share files and documents, manage task lists and engage in group discussions.
Central Desktop Features
* Create Online Discussion Groups – Reduce Email Chatter
* Share Version-Tracked Files and Documents
* Track Projects, Milestones and Tasks
* Manage Workgroup Calendars – iCal Enabled
* Setup in Minutes – Deploy Immediately