-Gmail
Gmail is a free, search-based webmail service that includes 1,000 megabytes (1 gigabyte) of storage. The backbone of Gmail is a powerful Google search engine that quickly finds any message an account owner has ever sent or received. That means there's no need to file messages in order to find them again.

-Research Papers
Dynamic Data Mining: Exploring Large Rule Spaces by Sampling. By Brin, Sergey; Page, Lawrence. Available in Postscript, PDF, and plain text formats. Paper from WWW10 by Google employees Amit Singhal and Marcin Kaszkiel. The Google File System. By Ghemawat, Sanjay; Gobioff, Howard; and Leung, Shun-Tak. The PageRank Citation Ranking: Bringing Order to the Web.

-Tools
2KRT: Keyword Ranking Tool. A free Microsoft Excel VBA application that can be used to check Google for keyword ranking and to track search engine rankings for various keywords over time. Uses Google API and API Web Service. Tool to preview sample AdSense ads with inputed URL.

-Web APIs
Tutorial on accessing the Google API with Macromedia Flash MX. PHP class library designed to make accessing the Google API using PHP via SOAP. Google Web API Example, Provides a platform independent and an easy-to-use C and C++ interface to the API. Includes sources and instructions for use.

-News and Media
A Search for Google’s Success Turns Up Two Words: Trust and Technology. BusinessWeek: Can Google's Prodigies Make a Search Tool Pay? Paul Festa's article: 'Popular search engine Google on Tuesday launched two sites for developing experimental search and browsing technologies. Press release about new services personalized Web search and Web alerts. Also explains the changes to the Google design and new search features.