ALL Official Chrome extensions for Google products

http://www.google.com/support/chrome/bin/static.py?page=guide.cs&guide=27542

Official extensions for Google products:
Extensions are a great way to add more features and functionality to the browser. Try out the following extensions available for Google products.

24 chrome extensions (data@july 2011):

• Blog This!:
  one-click service for posting.
• Docs PDF/PowerPoint Viewer:
  This extension automatically opens PDF, PowerPoint, and TIFF file links that you click in Google Docs Viewer. No need to download the files to your computer -- you see the document or presentation immediately in the browser.
• Email this Page
  This extension adds a button to the toolbar that you can click to email the link of the page you're on, using either your default email service or Gmail. The new email message opens in a new tab and is pre-populated with a link to the page, as well as any text you've highlighted on that page. Right-click the button and select Options to choose which email service should be used.
•  Favorite Doodle
•  Google Calendar Checker
•  Google Checkout Promo Notifier
•  Google Dictionary
  See instant definitions. This extension lets you double-click a word on a page to view its definition in a small pop-up bubble. The extension also adds a small icon to the address bar that you can click to search for a definition. You can set the dictionary language via the options menu for the extension.
•  Google Mail Checker
•  Google Quick Scroll:
  This extension helps you find info on a page that's most relevant to your Google search. When you click a search result after searching on Google, a dialog may pop up on the bottom-right corner of the page, showing one or more bits of text from the page that are most relevant to your search. Clicking the text will take you directly to that part of the page. 
•  Google Reader Notifier
•  Google Share Button:
  The same Google Share Button found in Google Toolbar for Internet Explorer and Firefox is now available as an extension for Google Chrome. Click the Share button and select your desired service from the drop-down menu. Frequently used services will appear at the top of the menu, and you can find more services by clicking "View more services" at the bottom of the Options menu. "addthis" is a better service.
•  Google Sidewiki
  http://ex-ample.blogspot.com/2011/07/all-about-web-annotation-service-google.html
•  Google Similar Pages beta
  Explore webpages similar to the one you're browsing. This extension adds a button the toolbar that you can click to find webpages that are similar to the page you're browsing. When you click the button, your browser searches Google for you to see if there are any webpages similar to the page you're browsing.
•  Google Translate.
  instantly translate entire webpages. This extension shows a banner at the top of the page whenever it detects that the language of a page you're on is different from the language you're using for your Google Chrome interface. Click the Translate button in the banner to automatically translate the page. You can also click the extension's button  to translate the page.
  http://www.google.com/support/translate/
•  Google Voice
  This extension adds a button to the toolbar that shows the number of unread messages in your Google Voice inbox. You can click the button to instantly see transcripts of your messages. You can also place a call or send a free text message via Google Voice from the button pop-up.
•  Knol Buddy
  This extension considers the page you are viewing and finds the most relevant knol for it. Click the button on the toolbar to visit the knol.
•  News Reader
•  orkut
•  RSS Subscription
•  Secbrowsing Plug-in Version Checker
  This extension alerts you through an address bar icon if you have a browser plug-in that's outdated. 
•  Select to Get Maps
  Instantly convert addresses into map links.This extension converts addresses you select on a web page into a map link. A pop-up appears with useful links for directions or to see the address on a map.
•  Send from Gmail
  This extension sets Gmail to open by default whenever you click an email address on a webpage. It also adds a button to the toolbar that you can click to email the link of the page you're on, as well as any text you've selected, using Gmail. To use an Google Apps email account with this extension, right-click the button and select Options. Enter your Google Apps domain and click Save.
•  Slideshow
  Turn your favorite photo sites into a slideshow.This extension adds a slideshow icon in the address bar whenever you visit Picasa, Flickr, Facebook, or Google Images. Click the icon to transform the page you're on into a slideshow. To go back to the standard view, click the x button at the top of the page.
•  Speed Tracer
  Get insights about your web application performance. This extension is geared for web developers who want to see performance statistics for their web applications. Click the button added to the toolbar to get a better picture of where time is being spent in your application. The extension visualizes metrics that are taken from low level instrumentation points inside of the browser and analyzes them as your application runs. You can analyze problems caused by:
• Javascript parsing and execution
• Layout
• CSS style recalculation and selector matching
• DOM Event handling
• Network resource loading
• Timer fires
• XMLHttpRequest callbacks
• Painting
• To use this extension, make sure you're using the developer version of Google Chrome and running the browser with the following command line flag: --enable-extension-timeline-api