Add SharePoint Snap-In to PowerShell ISE

Let me start off with saying that I, in no way, came up with this solution.  It was first shown to me by Shannon Bray (http://shannonbray.wordpress.com) when he and Gary Lapointe were maintaining spPowerShell.com.
Since the site is no longer available, I have had to grab the following information from Kirk Evens (Add Microsoft.SharePoint.PowerShell Snap-In to All PowerShell Windows) and from Spence Harbar (Adding SharePoint 2010 PoweShell cmdlets to your PowerShell ISE).

Open up Windows PowerShell ISE (Run as Administrator), and run the following script:

# set the execution policy to run scripts
set-executionpolicy unrestricted -force

# Create the profile
if (!(test-path $profile.AllUsersAllHosts)) {new-item -type file -path $profile.AllUsersAllHosts –force}
psEdit $profile.AllUsersAllHosts

In the new Tab,
For SharePoint 2010 add the following:

cd 'C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\CONFIG\POWERSHELL\Registration'
.\SharePoint.ps1
cd \ 

For SharePoint 2013 add the following:

cd 'C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\CONFIG\POWERSHELL\Registration'
.\SharePoint.ps1
cd \ 

Save the Profile tab (no, you do not run the script)

Again, thanks to Shannon, Kirk, Gary, and Spence for their posts!

UPDATE (01/16/2012)
After speaking with Shannon, he has finally moved over the blog...  you can find his ISE blog here...
http://shannonbray.wordpress.com/2010/06/23/sharepoint-and-powershell-ise/
UPDATE (10/21/2012)
Added the section for SharePoint 2013...