I came across this map a few weeks ago at Ibn Ayyub's blog, but neglected to mention it here. The map was created by Wang Daiyu, who writes the Islam in China blog and has recently created an Islam in China webzine. Both are very interesting if you've never visited there before.
The number of Muslims of Chinese descent in Singapore is very, very tiny. Per the "Census of Population 2000 - Demographic Characteristics" report, the number of Chinese Muslims here was 0.3% of the Chinese population as of 2000. That comes out to be roughly 7,500 Chinese Muslims over the age of 15. Milady has occasionally pointed out to me those Chinese Muslims whom she knows, but I haven't really had the chance to talk to them.