Windows SharePoint Services 3.0 SP2 and Microsoft Office SharePoint Server 2007 SP2
It is recommended your read KB Article 953338 before installing SP2.
Here are the links to the Service Packs!
WSS 3.0 SP2 : http://www.microsoft.com/downloads/details.aspx?FamilyId=79BADA82-C13F-44C1-BDC1-D0447337051B&displaylang=en
MOSS 2007 SP2 : http://www.microsoft.com/downloads/details.aspx?FamilyId=B7816D90-5FC6-4347-89B0-A80DEB27A082&displaylang=en
Enjoy!
