Interested in trying out Windows Sharepoint Services, but not ready to set it up on your own server? You can try it out online for 30 days for free at:

http://www.microsoft.com/windowsserver2003/techinfo/sharepoint/trial.mspx

When you're ready, you can evaluate it in your own environment by downloading a 180 day eval copy of Windows Server 2003 available here: http://www.microsoft.com/windowsserver2003/evaluation/trial/evalkit.mspx. Once the eval copy is downloaded, you can download Windows SharePoint Services here: http://www.microsoft.com/windowsserver2003/techinfo/sharepoint/wss.mspx. After the Windows Server 2003 and WSS download, you can also download a 120 day trial copy of SharePoint Portal Server here:  http://www.microsoft.com/office/sharepoint/prodinfo/trial.mspx