PowerShell is now available through Windows Update.

Microsoft Windows PowerShell is an extensible shell developed based on the .NET CRL and the .NET Framework, with a command line interface and a companion scripting language. The first version was released in 2006, in Windows 7 the second version of the shell is used. PowerShell works on any system with .Net 2.0 (Windows XP, Vista, Server 2003). Unlike most shells, which accept and return text, Windows PowerShell accepts and returns .NET objects, and also uses only objects in its work. This fundamental change makes it possible to use completely new tools and methods for administering and configuring Windows systems.

Like many other shells, Windows PowerShell provides access to the file system on your computer. In addition, Windows PowerShell includes providers that make it so easy to work with other data warehouses, such as the registry and digital signature certificates.

Russian-speaking resources on the topic:

PowerShell and other scripts - one of the first Russian blogs on PowerShell
Windows PowerShell - an article on WindowsFaq.ru
Meet PowerShell - article by Andrey Biryukov in Russian.
Free Russian book on PowerShell
Andrey Beshkov's blog - Andrey is involved in PowerShell in Russia, and holds many interesting webcasts on Windows Server 2008, NAP and PowerShell.
Zorion's Weblog is a good blog, but not for newbies.
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English-language resources on the topic:

Windows PowerShell or microsoft.com/powershell - the official technology website on the Microsoft website, contains links to articles, blogs, webcasts, etc.
Newsgroup is the web interface to the PowerShell newsgroup on the Microsoft website.
Script Center - examples and library of scripts, articles from the Scripting Guys on the Microsoft website.
Free book blog by Andrei Beshkov
Another free book on his blog.
Powershellcommunity.org is a community of PowerShell users, a library of scripts and links.
PwrShell.net