Reg Update to add Powershell to Plugable Protocol Handlers.

With the following registry additions, you can create a new URL protocol handler for PowerShell:

This allows me to do the following:
Start -> Run: ps:3+5
Start -> Run: ps:get-process
Start -> Run: ps:

A new powershell window opens, parses and executes the command and leave the window open.

Import the following to set it up:

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PS]
@="URL:Powershell Protocol"
"URL Protocol"=""
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PS\DefaultIcon]
@="\"C:\\WINDOWS\\system32\\WindowsPowerShell\\v1.0\\powershell.exe\",1"
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PS\shell]
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PS\shell\open]
[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\PS\shell\open\command]
@="\"C:\\WINDOWS\\system32\\WindowsPowerShell\\v1.0\\powershell.exe\" -NoLogo -NoExit -command $ExecutionContext.InvokeCommand.InvokeScript('%1'.Substring(3))"

Special thanks to Eriq VanBibber for the original post.