Official: Here Comes Jelly Bean For The Nexus S

Here we go, rejoice and sing a song of fun and laughter.
Jelly Bean is available OTA for the Nexus S now. And the manual links to download the official update file are here, too.

If you rock a Nexus S i9023 or i9020T you can manually get the 114MB file from the official Google-sevrers:

Update 4.0.4 (IMM76D) -> 4.1.1
Or via Mirrors: 1 - 2 - 3

• Put it in your main folder on your device and start the reboot with the usual procedure to enter the recovery menu.
• Power off your phone and hold the "Volume Up" key while pressing the power button.
• Choose "recovery" via the volume up/down buttons. Then you see a triangle on the screen. Hold power and press "Volume Up" again. You will get a list of options.
• Select "update" and the update starts.
• Don't get nervous, don't remove the battery. Just keep waiting, it could take a while.

Do it at your own risk.

And then have fun with Jelly Bean. It tastes so good...

Update: Well looks like I completely forgot the fact that with 4.0.4, you can't just use the stock bootloader to flash it. Take a look here, but I didn't try. So, waiting for the OTA is an option again.