User Agent Switcher for Google Chrome
With the help of some enthusiastic developers we have few of screen re sizer add-ons which can be used to re size the screen along with agent switcher. This takes us to more realistic way of developing and testing the mobile web sites. 
Now here, We have to maintain two add-ons. First is user agent switcher and other is screen resizer.
Recently i came across a tool which have these thigs in built and its Opera Mobile Emulator. Here we have user agent strings defined as per device and screen sizes as per the device. Please see below screen shot which gives clear idea about this
Opera Mobile emulator can be down loaded and installed from - http://www.opera.com/developer/mobile-emulator
