Google has some projects created by its own labs which are not widely known but they're quite useful. Here are some of its secret projects:
Google Compute: Uses your PC’s idle processing power for peer-topeer computing projects
Google Deskbar: Lets you search Google from the Windows taskbar
Google Glossary: Displays definitions for words you enter (see Secret
Google Keyboard Shortcuts: Lets you navigate your search results with your keyboard, no mouse necessary
Google News Alerts: Sends e-mail alerts to your desktop when new stories appear online
Google Search by Location: Lets you restrict your search to a specific geographic area
Google Sets: Creates a set of related items based on a list of words you enter
Google Viewer: Displays your search results as images in a kind of scrolling slide show
Google Voice Search: Enables Google searching by Web phone
Google Webquotes: Displays quotes about the pages in your search results
Source:Google Labs
