Team 3xtr3m3

This ROM is built from Google Android sources, with added functionalities from CM9 and AOKP to make it more comfortable and user-friendly, improving the user experience.

Main features

Built from Android sources (IMM76D)
Notification bar toggles and numeric battery indicator
Brightness control in status and notifications bars
Extended power menu with reboot, recovery and screenshot.
TV-Out
Video face effects working
Application killing with long press on back button
Removed "R" roaming indicator for national roaming
Root, Busybox and SuperSU
Kernel Semaphore 1.0.0s (387 MB RAM)
BigMem patch for 720p video
Preinstalled apps: OI File Manager, Barcode Scanner
APN's predefined huge list
Modified hosts file to remove ads in applications.

What works

Everything except device backup in Google's servers.

Known bugs

Can't store device backup in Google's servers
In certain situations, mobile data and silent toggles icons can be not properly updated.

Installation

You need CWM recovery to install the ROM. If you are in a stock Gingerbread ROM, flash a kernel with CWM.
Boot in CWM Recovery
Wipe data/factory reset
Select "Install zip from sdcard" and choose the ROM zip file you have downloaded
Install the gapps zip file
Reboot

Download Links

ICS333 RC1: http://www.mediafire.com/?nfwggba252ngg5a
GAPPS: http://goo.im/gapps/gapps-ics-20120422-signed.zip

Thanks to:

Huge thanks to Cyanogenmod team for their GalaxyS-specific code, AOSP modifications and gapps
AOKP team (brigthness control and fast application killing)
F4K for the BigMem patch
delta_foxtrot2 for modified hosts file link