PowerGUI's editor is nice and lightweight.  I wasn't crazy about the colors in the syntax highlighting.

Luckily, this can be customized.  Not with a GUI, but at least in the configuration XML - PowerShellSyntax.xml.  I replaced the Styles section with the following:

A Sample Render looks like:

$strComputer = "."
$colItems = get-wmiobject -class "Win32_LoadOrderGroup" -namespace "root\CIMV2" `
    -computername $strComputer

foreach ($objItem in $colItems)
{
   write-host "DriverEnabled: " $objItem.DriverEnabled 
   write-host "GroupOrder: " $objItem.GroupOrder 
   write-host "Name: " $objItem.Name write-host
}

I'm sure I'll tweak it, but I'm already happier using the product.