Yet another Logon Script
This looks interesting. I downloaded it and looked at it but I have not tried it. It's an AD driven logon script which can be configured to do lots of things without modifying the script. Configuration details are recorded in some of the lesser used AD object fields (notes, description).
It's also skinnable so you can either have a completely silent logon or a display with progress bar and information as to what's going on. Add to that a 'simulator' for debugging and it looks impressive.