Add-PSSnapin Microsoft.SharePoint.PowerShell
# IDS: 7,53
# $ids = 7,53
$webUrl = "http://acme.com/"
$listName = "Long List"

# show all fields
$w = get-spweb $webUrl
$l = $w.Lists[$listName]

[System.Collections.Generic.List[string]]$fldNames = $l.Fields|?{ -not $_.FromBaseType}| % {$_.InternalName}




$ids = $l.Items|%{$_.ID}# |Select-Object -First 15

$arr = [System.Collections.ArrayList]@()

Write-Host -NoNewline "Working "

[int]$cnt = 1

foreach($id in $ids){
	$item = $l.GetItemById($id)
    $ht = @{}
    $ht["ID"] = $item.ID
    $ht["Title"] = $item.Title
    $ht["Created"] = $item["Created"]

	foreach($fldName in $fldNames){
	  $fld = $l.Fields.GetFieldByInternalName($fldName)
	  $val = $item[$fld.Id]
	  $valStr = ""
	  if($val -ne $null){
		$valStr = $val.ToString()
	  }
      $ht[$fld.Title] = $valStr
	}
    $arr.Add($ht)|Out-Null
    $cnt++
    if(($cnt % 100) -eq 0) {
        Write-Host -NoNewline "."
    }
}


Write-Host " done"

Write-Host "Found $($arr.Count) items, stores in variable `$arr"