Latest Chromium 18 user agents:

User Agent Platform Device
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/12.04 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19 AlexaToolbar/alxg-3.1 Ubuntu 12 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/12.04 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19 Ubuntu 12 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/12.04 Chromium/18.0.1025.151 Chrome/18.0.1025.151 Safari/535.19 Ubuntu 12 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/11.10 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19 Ubuntu 11 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/11.10 Chromium/18.0.1025.151 Chrome/18.0.1025.151 Safari/535.19 Ubuntu 11 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/11.04 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19 Ubuntu 11 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/11.04 Chromium/18.0.1025.151 Chrome/18.0.1025.151 Safari/535.19 Ubuntu 11 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/10.10 Chromium/18.0.1025.151 Chrome/18.0.1025.151 Safari/535.19 Ubuntu 10 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/10.04 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19 Ubuntu 10 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/10.04 Chromium/18.0.1025.151 Chrome/18.0.1025.151 Safari/535.19 Ubuntu 10 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/12.04 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19 Ubuntu 12 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/12.04 Chromium/18.0.1025.151 Chrome/18.0.1025.151 Safari/535.19 Ubuntu 12 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/11.10 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19 Ubuntu 11 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/11.10 Chromium/18.0.1025.151 Chrome/18.0.1025.151 Safari/535.19 Ubuntu 11 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/11.10 Chromium/18.0.1025.142 Chrome/18.0.1025.142 Safari/535.19 Ubuntu 11 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/11.04 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19 Ubuntu 11 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/11.04 Chromium/18.0.1025.151 Chrome/18.0.1025.151 Safari/535.19 Ubuntu 11 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/11.04 Chromium/18.0.1025.142 Chrome/18.0.1025.142 Safari/535.19 Ubuntu 11 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/10.10 Chromium/18.0.1025.151 Chrome/18.0.1025.151 Safari/535.19 Ubuntu 10 Unknown
Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.19 (KHTML, like Gecko) Ubuntu/10.04 Chromium/18.0.1025.168 Chrome/18.0.1025.168 Safari/535.19 Ubuntu 10 Unknown