If you purchased your Nexus One from Google directly you may, or may not, have received a OTA update for your device. The update, named FRG83D, includes a few small patches to core applications that will no doubt pave the way for a quick and easy push of Gingerbread to the iconic Android device. It only weighs in at 1.3MB, so downloading it over data should be okay unless your provider charges you million to use unplanned data.
There’s no word on an update being pushed out to 1000 devices sold by Vodafone, as far as I know they didn’t push out the last update that became available for the device. So you may just have to sit back and wait for Gingerbread that is meant to be released ‘in the next few weeks’.