FEB CU comes in two different versions. The first version is in individual packages specific to a particular product like WSS , Project Server and MOSS. If you do not have MOSS installed and have already installed the infrastructure update for office servers then you can download and install these individual packages.
The second version is the Office Server Rollup Packages. This is a set of two uber-packages which contains all the fixes for WSS, Project Server and MOSS. These packages should be used when MOSS is part of the deployment or infrastructure update has not been deployed to the server environment. The Server Rollup Packages are much larger (~200MB) but they will greatly simplify MOSS patch deployment.
The Office Server Rollup Packages include all of the fixes included in the Infrastructure Update so installing these packages will allow you to skip the added step of deploying the Infrastructure Update. The Infrastructure update only needs to be installed once so this will not be a consideration for deployment that already have the Infrastructure Update installed.
Individual Product Packages ( WSS 3.0 + PSVR2007 )
Description of the Windows SharePoint Services 3.0 hotfix package (Sts.msp): February 24, 2009
Description of the Project Server 2007 hotfix package (Pjsrvapp.msp, Pjsrvwfe.msp): March 6, 2009
Office Servers Rollup Packages ( MOSS + PSVR2007 )
Description of the Windows SharePoint Services 3.0 cumulative update package: February 24, 2009
Description of the SharePoint Server 2007 cumulative update package (MOSS server-package): February 24, 2009
Project Client :
Description of the Project 2007 hotfix package (Project.msp): February 24, 2009