If you own a Nexus S android phone then there is a good news for you, a fresh Android 4.0 ROM is now available for your device, this is the same Ice Cream Sandwich firmware that will get released officially later. So if you don’t mind some minor bugs then you can try out this Android 4.0 ROM, download and other details after the break.
Download Android 4.0 for Nexus S
Download link [updated on 26 Oct. 2011]
via XDA forums