I'm not sure about other phones, but on the iPhone I can't stand mobile sites. The iPhone handles real websites just fine and I would prefer to view and navigate the real site, rather than a crippled mobile version. Because of their limits, I feel that mobile sites are less efficient than full sites. This seems contrary to their purpose. There are a few instances where mobile sites work well, such as web based email, but for the majority of the internet, I'd rather use the full site on my iPhone.