Robert Crane a local Sydney SharePoint Guru has released a free guide that gives a brief walkthrough on just what Companyweb is and what you can do with it. Robert is a wealth of knowledge on SharePoint particularly in the SBS / SMB space and his experience shows through in this guide.
SBS 2008 has built within it a very deep collaboration system based around Windows SharePoint Services which is a little brother to Microsoft Office SharePoint Server. WSS can do some amazing things for your business in terms of it s ability to centrally store and manage massive amounts of disparate information.
You can get a free copy of his guide here
You can also subscribe to his in-depth all questions answered Windows SharePoint Services Operations Guide here