Hi avatar2005,
Well the google proxy shows the webpage as it is seen from a cell phone.
Also good results if you use httProxy add-on for Flock, see
http://www.pcmesh.com.nyud.net:8080/ip-check.cgiA lot of webproxies give the originating IP via HTTP_X_FORWARDED_FOR, they do not show generall HTTP_REFERER. For HTTP_USER_AGENT you can use User Agent add-on to use Internet Explorer, Opera or Netscape (well it is faked), Then also REMORE_ADDR, REMOTE_HOST, REMOTE_USER should be anonymous.
Because some run $_SERVER['HTTP_X_FORWARDED_FOR] or $_SERVER['REMOTE_ADDR]
But the chained proxies are best, and have NoScript enables, because all these webproxies log through urchin.js etc.
polonus