Today in Tech: Introducing Windows 8

Fortune's curated selection of newsworthy tech stories from the last 24 hours. Sign up to get the newsletter delivered to you every day.

* Microsoft (MSFT) did a big unveiling for Windows 8. The operating system update features a radically different, streamlined user interface heavily influenced by the company's tile-based Windows Phone 7 operating system and optimized performance. (CNNMoney)

* Facebook made its Friends Lists feature smarter with new features like Smart Lists, which automatically creates and updates lists based on common profile information. (Facebook)

* Why Facebook's music service, reportedly set to launch on September 22, will transform the social network from a communications platform to a content site. (The Telegraph)

* RBC Capital's Mike Abramsky raised his fourth quarter iPhone (and iPad) estimates based off the results of a survey showing "unprecedented" demand for the iPhone 5. (Fortune)

* Twitter revealed during TechCrunch Disrupt that the social network is driving 100 million clicks a day to web sites. Meanwhile, the embeddable Tweet button is being used by over 3 million web sites. (TechCrunch)

* Social music-sharing service Turntable.fm announced a $7 million round of funding led by Union Square Ventures as well as an iPhone app. (GigaOm)

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