Whats a Google Custom Search Engine, and how does it differ from the Google Search Appliance?
Google Custom Search Engine is a free service hosted by Google that any individual or organization can use to create a specialized index of information in Google’s index and make it searchable from a website. To try out Custom Search Engines created by government agencies, see here. For information on the Google Search Appliance and other technology products for public sector organizations, see Google Enterprise Solutions for Government.