Microsoft has posted a 120 day evaluation edition of SharePoint Portal Server.
Microsoft SharePoint Portal Server brings together document management, advanced search capabilities, and an intranet portal within one easy-to-use server. Groups of any size can create, manage, and publish new content, and organize existing content.Download
Required Software
SharePoint Portal Server requires installation of either the evaluation edition or the full product of Microsoft Windows 2000 Server plus Service Pack 1 (SP1) or Windows 2000 Advanced Server plus SP1 to run. Both are included on the CD kit which will be available for order in May.