Google has made it available as a manual download for users who are keen to get the latest features that the upgrade brings. The most notable feature addition is the rumored Google Talk with video.
Instructions on how to install the download(zip.) have been made available at Gottabemobile. The process is straightforward and can be completed in five simple steps.
The download will work with users running Android 2.3.3 on the Nexus S model i9020T. The 2.3.4 update for owners of the original Nexus can be expected soon, although no official ETA has yet been made available.