This is what I hear from DD electronics in Singapore.
I was shopping for a D5000 twin lens kit for my wife, and noticed that they no longer stock them. I was informed that the D5000 has been discontinued.
I took a good look at the D3100, considering it as an alternative, but in the end decided that the D5000 was still my (her) preference. I've put in an order elsewhere and am waiting for it to be confirmed. Wonder how long it'll be before they get harder to find? Having said that, you can still buy the D40... though I was specifically after the twin lens kit!