[update]
The MoDaCo custom ROM for the Samsung Nexus S have reached version r3 (last time checked: 29/12) which built based on the GRH78 OTA release...
Some of its features:
- Packaged for ClockworkMod 3.0.0.0+
- Rebuilt using the MoDaCo MCR optimisation scripts
- Incorporates supercurio's EXT4 performance tweak
- Full up to date Google experience + additional apps (including new look Market)
- UK English for Voice Dialler
- HSPA icon differentiation ('H' icon when transferring data via HSPA)
- Insecure boot image
- su / Superuser.apk root
- Support for running scripts from /etc/init.d at startup
- Terminfo support (for nano etc)
- Busybox 1.18.1
- Optional GRH55 fingerprint without update nag
- Further enhancements to removing the OTA nag
- Optional 'allow SIP over non-WiFi connections' in the kitchen