Download WSS 3 and MOSS 2007 Trial Version

Microsoft has released WSS 3 and MOSS 2007 trial version.

Microsoft Office SharePoint Server 2007

http://www.microsoft.com/downloads/details.aspx?FamilyID=2e6e5a9c-ebf6-4f7f-8467-f4de6bd6b831&DisplayLang=en

Windows SharePoint Services 3.0

http://www.microsoft.com/downloads/details.aspx?FamilyID=d51730b5-48fc-4ca2-b454-8dc2caf93951&DisplayLang=en