I think SharePoint is one of the must have components everybody using Windows Server 2003 should have installed. As a free piece, the WSS version allows you to share files and collaborate with peers in the organization. It has document versioning capabilities in the web site and acts as central repository for document storage.
One of the coolest thing I find about it, is the integration with Microsoft Office InfoPath. InfoPath allows you to create forms that are routinely use in the business like purchase orders, expense reimbursement and management, vacation requests, etc. in an easy to use interface. Then you can publish these forms in SharePoint and every employee will be able to see them and fill them. Then you also have a central repository of forms.
The next step in this document and form collaboration environment is to add workflow or approval processes to these documents. That’s why we have made it easy to combine Procx and SharePoint workflow. Procx has features and activities for integration with SharePoint and InfoPath giving already established users of these platforms a huge return on their investments.