Multicultural communication is an area that studies how language, ethnicity, cultural differences, and sometimes even religion affects communication between individuals. It is a bit more academic than simply listening to natives talk - it attempts to provide evidence of why this occurs, as well as providing theoretical foundations for studying it in detail.
The major areas of research...
English
Arabic
French
Spanish
Portuguese
Deutsch
Dutch
Italiano
Russian
Romaian
Portuguese (Brazil)
Greek