Do you install any apps from Chrome Web Store?

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Though I have seen Apps section in my Chrome browser some time ago, I didn't bother to check it out, and later I forgot about it. Today, I was browsing the net, and I came across this Chrome Web Store. Only then I found out we can actually install lots of applications into our Chrome browser, and use them. It's really interesting and useful. I have just install "Screen Capture", as I always like to capture my screen, and crop it. This application is really helpful, as I don't need to open another program to crop the picture. What about you? Do you know about Chrome Web Store? Any apps do you suggest?