Microsoft has finally set up the Release for WSS (Windows SharePoint Services) and Microsoft Office SharePoint Server 2007 Evaluation version at :
Here are the Product Keys you will need when installing SharePoint Server 2007
- SharePoint Server Standard Trial: XJMKW-8T7PR-76XT6-RTC8G-VVWCQ
- SharePoint Server Enterprise Trial: F2JBW-4PDJC-HKXTJ-YCKRP-T2J9D (corrected)
For more resources about installation, upgrade, versioning, check this link, from Microsoft SharePoint Products and Technologies Team Blog.
Installation Instructions and ReadMe