Canadian journalist Mark Abley, like the Observer's associate editor Robert McCrum, is fascinated by the sheer variety of English spoken and used across the globe. He notes with amusement what's happening in Singapore: the government's attempts to promote standard English failing to dislodge the Singlish spoken on the streets.
He devotes several pages to Singapore and Singlish in The Prodigal Tongue: Dispatches from the Future of English. You could call it a traveller's notebook, exploring the differences in English from country to country. Anyone who loved The Story of English – where McCrum, Robert MacNeil and William Cran described how the language has evolved across the world – will enjoy reading this book.
Abley (photo from his website) met Singaporean academics like Kirpal Singh and Lubna Alsagoff and Colin Goh of Talking Cock. They all say Singlish is here to stay.