Why wait to get an official bite of Android 4.0 Ice Cream Sandwich when you can load it on your Nexus S right now? After a quick tease a few days ago, an early preview is available to all thanks to a few hard working developers, although beezy's post on Android Central warns you may have to live without WiFi and Bluetooth for the time being. His build is only tested on the Sprint Nexus S 4G, although concurrent work posted at XDA-Developers should give 3G Nexus S owners a shot at the port as well. As usual with these early tester ROMs YMMV, but those who enjoy life on the bleeding edge can hit the source links for more info.

[Thanks, Dan]