Google

Google.com has 610 URLs listed in 526 Dmoz categories.

TwitterBook
Provides a firefox extension to bookmark URL on twitter.
http://code.google.com/p/twitterbook/
Top/Computers/Internet/On_the_Web/Online_Communities/Social_Networking/Twitter/Browser_Plugins

Google Directory
Searchable directory based on the ODP, combined with their own PageRank algorithm within each category.
http://www.google.com/dirhp
Top/Computers/Internet/Searching/Directories/Open_Directory_Project/Sites_Using_ODP_Data/G

Google Scholar
Provides a search of scholarly literature across many disciplines and sources, including theses, books, abstracts and articles.
http://scholar.google.com/
Top/Computers/Internet/Searching/Search_Engines/Academic

Google
Enables users to search the Web, Usenet, and images. Features include PageRank, caching and translation of results, and an option to find similar pages. The company's focus is developing search technology.
http://www.google.com/
Top/Computers/Internet/Searching/Search_Engines/Google

Google Catalog Search
Search and browse mail-order catalogs online. Focuses on standard U.S. mail-order product catalogs which have prices printed in them and are designed to help customers make a purchase immediately.
http://catalogs.google.com/
Top/Computers/Internet/Searching/Search_Engines/Google

Google-Friends
Announcement list which is sent out monthly. Includes archives and subscription information.
http://groups.google.com/group/google-friends
Top/Computers/Internet/Searching/Search_Engines/Google

Google Product Search
Presents photographs of products and links to the stores that sell them online. Options to narrow search by price range, and view results as a grid of images.
http://www.google.com/products
Top/Computers/Internet/Searching/Search_Engines/Google

Google.public.support.general FAQ
Answers to questions that appear especially frequently in this newsgroup.
http://sites.google.com/site/tomihasa/google-general-faq
Top/Computers/Internet/Searching/Search_Engines/Google

Google Holiday Logos
Museum of Google logos commemorating holidays and events.
http://www.google.com/holidaylogos.html
Top/Computers/Internet/Searching/Search_Engines/Google

Google Introduces New Features
Press release about new services personalized Web search and Web alerts. Also explains the changes to the Google design and new search features.
http://www.google.com/press/pressrel/enhancements.html
Top/Computers/Internet/Searching/Search_Engines/Google/News_and_Media