For those of you trying to update the Nexus One to Gingerbread, beware. Apparently the update isn't too friendly to Google Voice.
The support page for Google Voice has a specific thread open to address the Android 2.3.3 upgrade. Basically, Google Voice app functionality is lost with the update, and the problem appears to have spread worldwide.
There is a fix found on the page that goes over installing and using an APK file, although the directions are a bit complicated...especially for something that Google should really address itself in another update.
If you have a Nexus One, have you experienced difficulties with updating to Android 2.3.3?