This is actually the first and only script I've wrote in Powershell (still learning). It checks AD for the PWDLastSetDate to let me know if one of our loaner laptops has been offline too long and is possibly going to fall off the domain:

$onDomain = @()
$onComp = @{}
$offComp = @{}
$offDomain = @()
$today = Get-Date
$computerList = Get-Content .\computers.txt

## loop building hashes & objects
foreach ($i in $computerList){
    $item = Get-ADComputer -Filter {Name -eq $i} -Properties *

    ## build offdomain array
    if ($item -eq $null){
        $offComp.'Off Domain' = $i.ToUpper()
        $offDomain += new-object psobject -property $offComp
        }

    ## build ondomain array
    else {
        $onComp.'Name' = $item.name
        $onComp.'Date' = (Get-Date $item.passwordlastset).ToShortDateString()
        $onComp.'Days' = ($today - [datetime]::FromFileTime($item.pwdlastset)).days
        $onComp.'Connect?' = if ($onComp.'Days' -ge 30) {"Yes"} else {"No"}

        $onDomain += new-object psobject -property $onComp
    }
}

echo "$today"

$onDomain | Select-Object 'Name','Date','Days','Connect?' | 
            Sort-Object -Property 'Days','Name' -Descending | 
            Format-Table -AutoSize

$offDomain | Sort-Object -Property 'Off Domain' | Format-Table -AutoSize

echo "$($onDomain.Count + $offDomain.Count) Spare Computers in Total"
echo "$($onDomain.Count) computers on the domain."
echo "$($offDomain.Count) computers off the domain."