Here is the latest and greatest for our Nexus S with extras... Simple Root adds Superuser,su, busy box and disables stock recovery preservation, Galaxy Nexus sounds dumps the sucky gingerbread sounds. Have fun .
i9020t/i90203 & i9020a (Both separate downloads)
Discontinued (Sorry for the inconvenience)
Face Unlock: Discontinued (Sorry for the inconvenience)
Galaxy Nexus Sounds: Discontinued (Sorry for the inconvenience)
Copy to usb storage and flash via clockworkmod recovery.
Google: For their work on Android and the related apps
Stephen (Stericson): Busybox
ranadroid: Mirror uploader
Thanks for the donation Thomas P (id put your xda username if i knew it)