Google for me is not just another search engine but it has become my all-time favorite web-life engine. My browsing, searching, documenting, managing experience has been enriched by different flavors Google offers. Following are the Google services that I use quite often during my web experience :

Desktop (Linux, Mac OS X, Windows 2000 SP3+/XP/Vista) : Desktop search application, that indexes e-mails, documents, music, photos, chats, Web history and other files. It allows the installation of Google Gadgets.
Gmail/Google Notifier (Mac OS X, Windows 2000/XP) : Alerts the user of new messages in their Gmail account.
Hello (Windows 98/ME/2000/XP) : Allows users to send images across the Internet and publish them to blogs.
Pack (Windows XP/Vista) : Collection of computer applications -- some Google-created, some not -- including Google Earth, Google Desktop, Picasa, Google Talk, StarOffice and Mozilla Firefox.
Picasa (Linux and Windows 2000/XP/Vista) : Photo organization and editing application, providing photo library options and simple effects. 

 Talk (Windows 2000/Windows XP/Server 2003/Vista) : Application for VoIP and instant messaging. It consists of both a service and a client used to connect to the service, which uses the XMPP protocol.

 Web Accelerator (Windows 2000 SP3+/XP/Vista) : Uses various caching technologies to increase load speed of web pages.
Browser Sync : (Firefox extension) : Saves browser settings for backup and use on other installations of Mozilla Firefox.
Toolbar : (Firefox and Internet Explorer extension) : Web browser toolbar with features such as a Google Search box, phishing protection, pop-up blocker as well as the ability for website owners to create buttons.
Blogger: Weblog publishing tool. Users can create a custom, hosted blogs with features such as photo publishing, comments, group blogs, blogger profiles and mobile-based posting with little technical knowledge.
Calendar : Free online calendar. It includes a unique "quick add" function which allows users to insert events using natural language input. Other features include Gmail integration and calendar sharing. It is similar to those offered by Yahoo! and MSN.
Docs : Document, spreadsheet and presentation application, with document collaboration and publishing capabilities.
FeedBurner : News feed management services, including feed traffic analysis and advertising facilities.
Gadgets : Mini-applications designed to display information or provide a function in a succinct manner. Available in Universal or Desktop format.
Gmail : (Also known as Google Mail) Free Webmail IMAP and POP e-mail service provided by Google, known for its abundant storage and advanced interface. It was first released in an invitation-only form on April 1, 2004. Mobile access and Google Talk integration is also featured.
iGoogle : (Previously Google Personalized Homepage) Customizable homepage, which can contain Web feeds and Google Gadgets, launched in May 2005. It was renamed to iGoogle on April 30, 2007 (previously used internally by Google).
Notebook : Web clipping application for saving online research. The tool permits users to clip text, images, and links from pages while browsing, save them online, access them from any computer, and share them with others.
Orkut : Social networking service, where users can list their personal and professional information, create relationships amongst friends and join communities of mutual interest. In November 2006, Google opened Orkut registration to everyone, instead of being invitation only.
Page Creator : Webpage-publishing program, which can be used to create pages and to host them on Google's servers.
Picasa Web Albums : Online photo sharing, with integration with the main Picasa program.
Reader : Web-based news aggregator, capable of reading Atom and RSS feeds. It allows the user to search, import and subscribe to feeds. The service also embeds audio enclosures in the page. Major revisions to Google Reader were made in October 2006.
Shared Stuff : Web page sharing system, incorporating a Share bookmarklet to share pages, as well as a page for viewing the most popular shared items. Pages can also be shared through third party applications, such as del.icio.us or Facebook.
YouTube : Popular free video sharing Web site which lets users upload, view, and share video clips. In October 2006, Google, Inc., announced that it had reached a deal to acquire the company for $1.65 billion USD in Google's stock. The deal closed on 13 November 2006.
Maps : Mapping service that indexes streets and satellite imagery, providing driving directions and local business search.

 Alerts: E-mail notification service, which sends alerts based on chosen search terms, whenever there are new results. Alerts include web results, Groups results news, and video.
Book Search: (Previously Google Print) Search engine for the full text of printed books. Google scans and stores in its digital database. The content that is displayed depends on the arrangement with the publishers, ranging from short extracts to entire books.
Directory : Collection of links arranged into hierarchical subcategories. The links and their categorization are from the Open Directory Project, but are sorted using PageRank.
Experimental Search : Options for testing new interfaces whilst searching with Google, including Timeline views and keyboard shortcuts.
Groups : Web and e-mail discussion service and Usenet archive. Users can join a group, make a group, publish posts, track their favorite topics, write a set of group web pages updatable by members and share group files. In January, 2007, version 3 of Google Groups was released. New features include the ability to create customised pages and share files.
Image Search : Image search engine, with results based on the filename of the image, the link text pointing to the image and text adjacent to the image. When searching, a thumbnail of each matching image is displayed.
Language Tools : Collection of linguistic applications, including one that allows users to translate text or web pages from one language to another, and another that allows searching in web pages located in a specific country or written in a specific language.
News : Automated news compilation service and search engine for news. There are versions of the aggregator for more than 20 languages. While the selection of news stories is fully automated, the sites included are selected by human editors.
Patent Search : Search engine to search through millions of patents, each result with its own page, including drawings, claims and citations.
Scholar : Search engine for the full text of scholarly literature across an array of publishing formats and scholarly fields. Today, the index includes virtually all peer-reviewed journals available online.
Suggestreade : Auto-completion in search results while typing to give popular searches.
University Search : Listings for search engines for University websites.
Video : Video search engine and online store for clips internally submitted by companies and the general public. Google's main video partnerships include agreements with CBS, NHL and the NBA. Also searches videos posted on YouTube.
Web History : (Previously Google Search History / Personalized Search) Web page tracking, which records Google searches, Web pages, images, videos, music and more. It also includes Bookmarks, search trends and item recommendations.
Web Search : Web search engine, which is Google's core product. It was the company's first creation, coming out of beta on September 21, 1999, and remains their most popular and famous service. It receives 1 billion requests a day and is the most used search engine on the Internet.