If you are looking for the Configuration Packs for ConfigMgr 2007, Microsoft has moved them to their new Pinpoint search management facility. There’s currently no defined way of finding them except to use Pinpoint’s search engine. However, here is the search URL for quick access:
http://pinpoint.microsoft.com/en-US/SearchResults.aspx?qs=configuration%20pack&fl=&fpf=700004&fst=1