The latest post SP1 global WSS and MOSS patches are:

Description of the SharePoint Server 2007 hotfix package: March 27, 2008

http://support.microsoft.com/?id=950487

 

Description of the Windows SharePoint Services 3.0 hotfix package: March 27, 2008

http://support.microsoft.com/?id=950484

The lastest post SP1 localized WSS (no localized MOSS patches after SP1 yet) patch is:

Description of the Windows SharePoint Services 3.0 hotfix package: February 22, 2008

http://support.microsoft.com/?id=948957

You need all three of these patches installed to be running the most current WSS and MOSS updates.

 

Your build number will be 12.0.0.6308 after this installation.