The SharePoint 2007 Infrastructure Update is a must have install including numerous performance and stability hotfixes. Make sure to install this one. For more info see the SharePoint team blog

http://blogs.msdn.com/sharepoint/archive/2008/07/15/announcing-availability-of-infrastructure-updates.aspx

 

 

X86

X64

WSS

http://www.microsoft.com/downloads/details.aspx?FamilyId=3811C371-0E83-47C8-976B-0B7F26A3B3C4&displaylang=en

http://www.microsoft.com/downloads/details.aspx?FamilyId=3A74E566-CB4A-4DB9-851C-E3FBBE5E6D6E&displaylang=en

MOSS

http://www.microsoft.com/downloads/details.aspx?FamilyId=256CE3C3-6A42-4953-8E1B-E0BF27FD465B&displaylang=en

http://www.microsoft.com/downloads/details.aspx?FamilyId=6E4F31AB-AF25-47DF-9BF1-423E248FA6FC&displaylang=en

Project Client

http://www.microsoft.com/downloads/details.aspx?FamilyId=F385ADB8-0425-4BA4-BECE-7664B8F49D12&displaylang=en

N/A