The October 28th issue of PCMag has "20 Great Google Secrets".
Here are some highlights to check out...
Advanced operators that can help narrow down your search results. -
http://www.google.com/help/operators.html Index of literally millions of messages from decades of discussion on Usenet. -
http://groups.google.com Index of products from online stores. -
http://froogle.google.com Features products from ~6,000 paper catalogs in a searchable index. -
http://catalogs.google.com There's a complete list of Google's tools and services at
http://www.google.com/options There's a 3rd-party site
http://www.googlealert.com that monitors your search terms and emails you information about new additions to Google's web index.
This beta version of Google News Alerts can monitor up to 50 news queries per email address and can send you information about news stories that match your query. -
http://www.google.com/newsalerts This place holds some of Google's toys that are in the tinker phase. -
http://labs.google.com