Peetersonline.nl - Using PowerShell for (virtually) everything!

Microsoft TechNet Script Center - VBScript-to-Windows PowerShell Conversion Guide
Microsoft TechNet - about_CommonParameters as it applies to Windows PowerShell 2.0
Microsoft TechNet - Using the Write-Host Cmdlet with a list of the available color parameters.

Under The Stairs - PowerShell Version 3 Updatable Help Content
Coretech - Capture output from command line tools with PowerShell
Stack Overflow - Capture EXE output in PowerShell
Mad With PowerShell - [Math] in PowerShell see also:MSDN - .NET Framework Class Library - System - Math Class - Math Methods.
TechNet Magazine > Home > Issues > 2007 > November > Windows PowerShell: Writing Regular Expressions

Computer Performance - Windows PowerShell - Conditional Operators -Match, -Like, -Contains, -In, -NotIn
tjrobinson.net - Powershell: -contains vs. -match and -like

Checking for null in PowerShell

Using String Functions
Converting ASCII and Characters
Use $null to Identify Empty Data
Test whether Registry Key exists
Test whether Registry Value exists
Dynamically Create Script Blocks

The Exchange Team Blog - Programmatic Access via Remote PowerShell in Exchange Server 2010
stackoverflow - Cannot disable or enable an Exchange mailbox running a Powershell command inside C#

Jonathan Medd's Blog - Using SSH to Access Linux Servers in PowerShell
Svendsen Tech PowerShell Wiki - SSH from PowerShell using the SSH.NET library
PowerShellMagazine - Posh-SSH: Open Source SSH PowerShell Module

Windows PowerShell Blog - Looking Forward: Microsoft Support for Secure Shell (SSH) mentions possible upcoming support for SSH in Windows/PowerShell.

Microsoft Download Center - Windows Management Framework 5.0 contains PowerShell v5 for Windows 7 SP11, Windows 8.1, Server 2008 R2 SP1, Server 2012, and Server 2012 R2.
Microsoft Download Center - Windows Management Framework 4.0 contains PowerShell v4 for Windows 7 SP1, Server 2008 R2 SP1, and Windows Server 2012.
Microsoft Download Center - Windows Management Framework 3.0 contains PowerShell v3 for Windows 7 SP1, Server 2008 R2 SP1, and Windows Server 2008 SP2.
Microsoft Support - Windows Management Framework (Windows PowerShell 2.0, WinRM 2.0, and BITS 4.0) contains PowerShell v2 for Windowx XP, Vista, Server 2003, and Server 2008.

Microsoft Download Center - Windows PowerShell 4.0 and Other Quick Reference Guides
Microsoft Download Center - Windows PowerShell 3.0 and Server Manager Quick Reference Guides