The whole point of the Mobile Safari Browser is that you can have a PC optimized website on a mobile device. But, I think if you log into your google account, you can set it to display as the mobile interface. Not sure, just a guess.
if i go to google.com in safari on my ipod, it automatically detects my ipod and directs me to google's ipod/iphone optimized site. if i click on the address bar at the top of safari and use the built in google search, it uses the standard google interface. I would like to set this to use the iphone optimized interface (www.google.com/m) to search if this is possible in some way.