Microsoft has published an online demo, where you can get familiar with the newest features of the latest Windows SharePoint Services version.
Watch this demo to see how a Microsoft Windows SharePoint Services 3.0 site can be your team’s communication center. See how you can use documents, lists, wikis, and blogs to track, store, and share information. Take a look at how search capabilities, multiple navigation options, and RSS make it a snap to find what you’re looking for, and how version control and document recovery help ensure that team members stay on top of their information.
See the demo: Tour a Windows SharePoint Services 3.0 site.