One Brigada user recommends Virtual Filing Cabinet:

http://www.carmelvision.com/vfc/wvfc.shtml

It will support 200 concurrent users, all sharing files together. It lets them keep their emails, faxes, notes, meetings, appointments, document management, document collaboration with other Workgroup VFC users, on-demand PDF conversion, bulk email, document scanning, business card scanning, GPS enabled mapping, and import/export to outlook all in one easy-to-use solution. Of course, your mileage might vary. And some might say — ouch … $99 is steep. But remember — that’s a one-time cost. But with products like Central Desktop…

http://www.centraldesktop.com/

(which has new hooks into Office that will blow your mind) and…

https://www.dropbox.com/

(which has become a kind of de facto file-sharing solution for some)

Virtual Filing Cabinet might be pushed to the back of the drawer. But isn’t it great to have some choices!? :-)