CyanogenMod is without a doubt the most popular and prolific of the myriad custom Android ROMs, and now that the Ice Cream Sandwich source code is available, the team is hard at work on an Android 4.0 version. Cyanogen and his teammates only work with AOSP code, so they haven't bothered with the various SDK ports that have popped up recently. Steve "Cyanogen" Kondik confirmed that work has begun in his Twitter feed.