There are lots of sites that do not have support to be accessed via mobile devices. Some sites do provide support like m.yahoo.com (yahoo customized for mobile devices...). But most of the sites do not have support and looks distorted when accessed by devices.

http://www.google.com/gwt/n

The above link helps you in converting webpages suitable to mobile devices.
Mobile browsers do help in converting web-pages sometimes... when it does not, this tool comes in handy.