ConvertTo-TitleCase.ps1

function ConvertTo-TitleCase {
<#
.SYNOPSIS
 Converts strings to Title Case
.DESCRIPTION
 The ConverTo-TitleCase function capitalizes the first letter of each word in a string of text and converts the remaining letters in each word to lower case (Title Case).
.INPUTS
 System.String
.OUTPUTS
 System.String
.EXAMPLE
ConvertTo-TitleCase -String 'The wINDOWS PowerShell TFM book CONTEST aNd GiVeAwAy'

Output:
-------
The Windows Powershell Tfm Book Contest And Giveaway

Converts a string to upper case first letter and lower case remaining letters
.EXAMPLE
'The wINDOWS PowerShell TFM book CONTEST aNd GiVeAwAy' | ConvertTo-TitleCase

Output:
-------
The Windows Powershell Tfm Book Contest And Giveaway

Converts a string from pipeline to upper case first letter and lower case remaining letters
.EXAMPLE
'aNother weIRd STRING to conVerT', 'The wINDOWS PowerShell TFM book CONTEST aNd GiVeAwAy' | ConvertTo-TitleCase

Output:
-------
Another Weird String To Convert
The Windows Powershell Tfm Book Contest And Giveaway

Converts multiple strings from pipeline to upper case first letter and lower case remaining letters
#>
    [CmdletBinding()]
    Param(
        # Specifies the string to convert to Title Case.
        [Parameter(
            Mandatory = $True,
            ValueFromPipeLine = $True
        )]
        [ValidateNotNullOrEmpty()]
        [String[]]
        $String
    )


    PROCESS {

        foreach ($Str in $String) {

            $ConvertedWords = @()

            # Split string into individual words
            $Words = $Str -split ' '
            
            foreach ($Word in $Words) {
                
                # Check length of words to deal with multiple spaces in string
                if ($Word.Length -gt 0) {
                    
                    $ConvertedWords += "$($Word.Substring(0, 1).ToUpper())$($Word.Substring(1, $Word.Length -1).ToLower())"

                }
                else {

                    $ConvertedWords += ''

                }
                
            }

            # Output converted string
            Write-Output ($ConvertedWords -join ' ')

        }
    
    }

}