Want to give Windows 8's new look a try? Starting tonight, you'll be able to download a Windows 8 developer preview release straight from Microsoft.

The Windows 8 preview code will be available as an ISO file tonight from Microsoft's developer website (no specific time has been released). You'll have a choice of a 64-bit version, with an option for developer tools, and a 32-bit version that comes without tools. Sample apps--a Twitter client, a Facebook client, games and more--are also included.

Because this is prerelease code, a clean install is required. "It is not a beta release," Microsoft's Steven Sinofsky wrote in a blog post. "We will be updating the release with various quality updates and drivers over the coming weeks/months just to exercise our overall update and telemetry mechanisms."

Windows 8 is a major overhaul to Microsoft's PC operating system. It's designed with touchscreens in mind, launching into a Metro-style user interface with touch-friendly apps, but it also accommodates standard input devices. The traditional Windows desktop is represented as an app within the broader Windows 8 interface, and the preview build already supports Windows 7 applications.

For more on Windows 8, check out Jason Cross' hands-on preview of the developer build on a prototype tablet.

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