The same video chat that users have been enjoying on Android 3.0 and tablets is making it's way to the Nexus S. With other 2.3 devices to receive the update in the near future. Luckily as it usually is we have a manual download available.  Download file from Google. Use the usual steps for a manual update install (listed below).

• Place file in the root of your internal storage
• Shut down your phone, and reboot into the bootloader by holding volume up and powering back on
• Use the volume buttons to choose "recovery" from the list, and select it with the power button
• When you see the triangle on your screen, hold power and then press volume up and you'll have a list of options, choose the file to update

 I saw earlier today that this update has been made available for rooted phones as well through a bit of a hack/work around so be sure to look for that here.

Also the 2.3.4 update for the Nexus One is rolling out as of this post. This update does not include the new videochat or voice features.  If you don't want to wait for the update you can click here for the manual download.