Nicholas Bakalar has a quite decent NY Times story about Light Warlpiri, a mixed language of Australia that's developed in the last few decades:
The language, called Warlpiri rampaku, or Light Warlpiri, is spoken only by people under 35 in Lajamanu, an isolated village of about 700 people in Australia’s Northern Territory. In all, about 350 people speak the language as their native tongue. Dr. O’Shannessy has published several studies of Light Warlpiri, the most recent in the June issue of Language.There's a brief post about it by Sally Thomason at the Log. (Thanks for the Times link, Bonnie!)“Many of the first speakers of this language are still alive,” said Mary Laughren, a research fellow in linguistics at the University of Queensland in Australia, who was not involved in the studies. One reason Dr. O’Shannessy’s research is so significant, she said, “is that she has been able to record and document a ‘new’ language in the very early period of its existence.”
Everyone in Lajamanu also speaks “strong” Warlpiri, an aboriginal language unrelated to English and shared with about 4,000 people in several Australian villages. Many also speak Kriol, an English-based creole developed in the late 19th century and widely spoken in northern Australia among aboriginal people of many different native languages.
Lajamanu parents are happy to have their children learn English for use in the wider world, but eager to preserve Warlpiri as the language of their culture.