You may find the below collection of scripts useful for your daily windows administration.
[SOURCE : http://techibee.com]

General Powershell:

• How to find your powershell version
• How to change text to title case using powershell
• How to convert a string to array
• Create a powershell variable to always show current time
• Tip for easy navigation in powershell console
• Change WMI time format to local time format using powershell
• How to install Powershell in on Windows 2008 R2 Core server
• Add color to powershell codes while posting to your blog
• Convert a date from string type to date time object using powershell
• How to get pop-up message box using powershell
• $OFS — a special variable in powershell
• List duplicate entries count in powershell array using powershell
• Expand values in multi-valued property using powershell
• How to find variable type in powershell
• Administering remoting feature in Windows 7 powershell
• Use powershell to know given path is absolute or relative
• Remove items from array using powershell
• Eject CD drive using powershell
• Get online help account about powershell commands
• How to assign output to variable and print on the console at the same time
• Find out the functions and cmdlets in a powershell module

General Windows:

• Get windows cluster instances status using powershell
• Uninstall Hotfixes using powershell
• How to get list of mapped network drives using powershell
• Assign static IP address to Windows computer using powershell
• Get laptop battery charging status using powershell
• Get the laptop battery state using powershell
• Change monitor brightness using powershell
• Minimize all windows and applications using powershell
• Get CPU architecture using powershell
• Get CPU utilization of remote computer using powershell
• Query application error events from application log using powershell
• Change Windows Event log size using powershell
• Enable auto login for administrator account in windows 7 using powershell
• Query error events in event log using PowerShell
• Audit local administrator password on workstations and servers using powershell
• How to get hardware details of remote computes using powershell
• A script to monitor your server restart
• Get Operating system architecture (32-bit or 64-bit) using powershell
• Pin applications to task bar using powershell
• Close applications gracefully using powershell
• Get disk free space details from remote computer using powershell
• Get remote computer uptime using powershell
• Check if a registry key exists on remote computer using powershell
• Clear event log using powershell
• Query performance counter values using powershell
• Start application in minimized, maximized and hidden modes using powershell
• Check application installation status using powershell

File and Folders:

• How to create temporary files using powershell
• Query file creation time, modification time, size, and permissions using powershell
• Get folder size using powershell
• How to compare two file versions using powershell
• Merge file contents using powershell
• Find zero size files using powershell

Process Management:

• Find the owner of a process using powershell
• Easy way to kill processes on remote computer using powershell
• Get process details of remote computer using powershell

BIOS:

• How to get BIOS details of remote computer using powershell

Service Management:

• Start/stop/restart services on remote computer using powershell
• How to get logon account of services on remote computer
• Easy and quick way to stop/start/restart services on remote computer using powershell

Network Management:

• How to test TCP port connectivity using powershell
• Resolve Name to IP and IP to Name using powershell
• Get Network adaptor connection status using powershell
• Get list of hidden shares in your network using powershell

VMware:

• Expand virtual machine hard disk using powershell
• Find who else connected to a VM console in Virtual Center
• Download Powershell CLI cmdlets quick reference poster

SCOM:

• How to use SCOM cmdlets from normal powershell console
• Get SCOM groups of a computer using powershell

Active Directory:

• How to know originating DC of a active directory object using powershell
• Query active directory group members using native cmdlets
• Get Domain controller details using powershell

Exchange:

• Verify public folder replication status using powershell

MISC:

• Convert VB script to Powershell
• SCVMM powershell cmdlet reference
• Get database list from SQL server using powershell