UPDATE:
For those of you that rooted and installed Superboot and multi touch brower. You are more than likely having problems getting the new N1 update onto your phone. Whether its OTA or otherwise.
You will need Amon-Ra's recovery tool 1.5.3 located here -
[GUIDE] Rooting and Installing Amon Ra's Recovery on the Nexus One - Android Forums
All instructions on how to install Amon-Ra's recovery are on that web page. If i can do it... anyone can!
Once you have the new recovery You will need the google update and radio update located here -
02/Feb ERE27 - Full new update in main update zip, radio update zip, insecure boot image and superboot image - Android @ MoDaCo
Download the main update and the radio update.
Put them both onto your SD cards root directory
boot into the recovery menu by holding the VOL- key and power button.
Select Flash Zip from SD card.
Update the radio 1st. Follow on screen instructions. It will reboot back into the recovery when you restart the phone.
Select the main update and again follow on screen instructions.
Reboot your phone...
Voila!
There Are MANY guides out there saying exactly what i have just said. But they are all assuming you know your N1 and Android like the back of your hand. Both of which are false for me. I hope this helps another complete n00b lol
Credits to Aman-Ra for his excellent recovery tool. And MoDaCo for providing the update in a usable form
