For foreign companies looking to dip a toe in the fresh pool of Chinese e-commerce space, the waters are warm and inviting. After all, China’s middle class will swell to about 800 million people in the next 20 years, according to Acquity Group, a brand e-commerce and digital marketing firm that just released a new report on the Chinese digital market. Chinese online consumers have a total spending income of more than $2.7 trillion. The population is widely distributed, the report finds, but the Internet and mobile penetration rates are growing, reaching 34% in January 2011 with about 457 million users.