Opera 10.50 Build 3172 pre-Alpha

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Opera's description:

- Carakan is our new JavaScript engine

- using Presto 2.5, which contains a huge numbers of improvements. It
also includes support for CSS3 transitions and transforms, and more
HTML5 features like persistent storage

- Vega is our new graphics library

- On Windows 7/Vista, you will notice a lot of visual changes and use
of APIs which allow the UI to display the Aero Glass effect

- For Windows 7, we also added Aero Peek and Jump List support to
easily access your Speed Dials, Tabs, etc. from the Taskbar

- For Mac, a complete rewrite in Cocoa brings an Unified Toolbar,
native buttons and scrollbars, multi-touch gestures (try 3-Finger
Swipe Left/Right or Pinch to zoom) and a bunch of other small details

Windows version
http://snapshot.opera.com/windows/Opera_1050_3172_en.exe