When Google Chrome entered into the world of web-browsers, it lacked both extensions and Greasemonkey support. But now it supports both Gresemonkey scripts and extensions. Here is a list of top 10 Google Chrome plugins through which you can really enhance your browsing experience in Google Chrome. We have already shared how you can use these extensions (Windows | Linux) and Greasemonkey scripts (Windows | Linux) in Google Chrome. Still if you want to know how you can install Google Chrome CRX extensions then proceed here.
Tidbit : View Top 10 Extensions/Addons For Mozilla Firefox
AdSweep
AdSweep is a Google Chrome extension through which you can get rid of advertisements while surfing web. AdSweep works just like a Firefox extension Adblock Plus. What it basically do is that it defines such CSS rules which hide the elements showing advertisements on the webpage.

Official Page | Download AdSweep.crx | Optional : Download AdSweep.user.js
Gmail Checker
It displays how many unread emails are there in your Gmail inbox. This small information is shown in toolstrip of Google Chrome.
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Official Page | Download Gmail.crx
PageRank
PageRank is well-known criteria to check the popularity of a webpage. This is one of the most used extensions by all SEO experts / bloggers. Every time you load a new webpage, it shows its PageRank in the toolstrip.

Official Page | Download PageRank.crx | Our Review
TwitterFx
TwitterFx is extremely cool twitter extension for Google Chrome which allows you to tweet right from your Google Chrome toolstrip. You can also read tweets of the people you follow without even opening twitter.com. All tweets scroll in your toolstrip just like a news feed.
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It requires some basic installation instructions which you can find here.
Official Page | Download TwitterFx.zip | Our Review
Chrome.fm
With Chrome.fm extension, you can listen music from your Last.fm account via toolstrip. You have got five control buttons in toolstrip i-e play, next, skip, stop, love and ban button.
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Official Page | Download Chromefm.crx
Facebook Notifications
Retrieves the number of notifications from your Facebook account. You have to be logged in to Facebook for this extension to work. Its a must install for Facebook fans.
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Official Page | Download Facebook.crx
Chrome Clock
Chrome Clock is an alarm clock which runs on the toolstrip of your Google Chrome browser.
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Official Page | Download ChromeClock.crx
Chrome Gestures
Adds a number of mouse gestures to Chrome.

Official Page | Download ChromeGestures.crx
Aniweather
Detailed weather report in the browser’s toolstrip. Also available as a Firefox addon.
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Official Page | Downlaod Aniweather.crx
Flashblock
Blocks all Flash content from loading. It then leaves placeholders on the webpage that allows you to view the Flash content.

Official Page | Download Flashblock.crx
Here is another one created by me
Chrome whos.amung.us
Access whos.amung.us counter of your website / blog in your Chrome's toolstrip. Enjoy

Official Page | Download From Here | Instructions To Install
Please do mention in comments if you have got any other Google Chrome extension worth sharing.
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You should also checkout the FlashPlus Extension. You can resize, move and maximize Flash – Games, Videos, etc to full browser. A demo on youtube – http://www.youtube.com/watch?v=1CHktLVF0yM
Link to the extension : https://chrome.google.com/extensions/detail/emaamodndfmmmcjepfigalbjjjemadom
“IE tab” extension distorts the web page rendering capability of the Chrome browser.
Recently, got the Chrome browser updated to the current version 4.0.249.78. I also installed the “IE Tab” extension, among several others. With the new upgrade, I started facing difficulty in getting full access to the yahoogroups site. For example, after logging into yahoogroups.com when I clicked on a hyperlink to access my group’s page, I got garbled pages generated by the browser. Even while attempting to login with ‘Connect with facebook’ for CNET news site, a similar garbled page was generated by Chrome. But the earlier version of Chrome, without the extensions, had no problems with these sites. (However, these sites were getting rendered properly within the “IE tab” extension, albeit, with some script error messages.)
On doing a small ivestigation, I discovered that the “IE Tab” extension, which I had installed immediately after the upgrade of the Chrome browser, was the culprit. After I had uninstalled this extension, Chrome was back to normal. It rendered both the websites properly like its earlier avatar.
Surely, there is some conflict between the “IE tab” extension and the Chrome browser version 4.x. The bugs need to be ironed out for this extension. Also, its worrisome that this extension seeks access to the entire computer.
Yes these extensions from chrome will really useful to get email and social networking updates, shopping, listening to music … wow ! great features right from our browser with single click.
You might want to take a look at Autopen – Email Signatures http://bit.ly/8EaeCL It is a full featured email signatures app for gmail/google apps. Has a great rich text editor, unilimited signatures, different signature defaults for different email addresses and a sync service that will keep your signatures synchronized between different computers.