Laurent de Quartz is a foreigner who teaches bahasa Indonesia to other foreigners. He stays in Republic of Indonesia about 5 years. He manages an online dictionary http://www.sederet.com it is a great place to master vocabulary. He also manage other websites : http://www.cookdojo.com and http://www.groupvita.com.
The national Indonesian language is called bahasa Indonesia. Mastering Indonesian language is easy as one two three. Actually, bahasa Indonesia is the most easy language to learn. A tourist/visitor who stays a week in Bali , Indonesia can talk basic bahasa Indonesia fluently than someone who learns Chinese language in a month.