One of the challenges of a Enterprise Search Solution is to integrate local desktop search exprience like WDS 3.01 with central manged search like MOSS 2007 offers. Today there is an easy way to combine these two indexes into one to give the end user one place to enter the search queries.
To enable this you have to take 3 steps
1. Download, extract and Install WDS 3.01
2. Add the WDS ADM Definition to the Group Policies
3. Define the Intranet (MOSS) Search location via Group Policies
The first step is a easy one download the WDS 3.01 from http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=0e0423b4-d396-4986-a1bb-793122fcc65d. Extract the installation files by running the installation application with the /extract switch. This is an important step, otherwise the ADM file is not installed on your machine and you can not add any intranet locations to WDS.
Now start the MMC and add the Group Polices Snap-In:
Add the WDS Administrative Template
you can find the ADM file in the "update" Folder at the location where you extracted the installation files
After Adding the WDS ADM File you can Add the Primary Intranet Search location:
you must set the primary search location to http://[MOSS Server Name]/SearchCenter/Pages/results.aspx?k=$w The WDS will replace the $W placeholder by the search terrm the user has entered.
After that you find a new Button and a new result in your WDS Search Box
Joel Oleson's Blog
WDS 3.01 Administration Guide