Google offers several services that give you a head start in focusing your search.
Google Groups
(http://groups.google.com)
indexes literally millions of messages from decades of discussion on Usenet.
Google even helps you with your shopping via two tools:
Froogle
CODE
(http://froogle.google.com),
which indexes products from online stores, and
Google Catalogs
CODE
(http://catalogs.google.com),
which features products from more 6,000 paper catalogs in a searchable index. And this only scratches the surface. You can get a complete list of Google's tools and services at
www.google.com/options/index.html.