That's really good. I don't keep an eye on the Australian charts, but I guess it's his first #1 single there or did the other 2 also go to #1??
Rock Your Body is also doing great here in Holland ... top 10 already. Justin Timberlake is doing awesome all over the world.
EDIT: Already read the answer.
Like I Love You and Rock Your Body are my favorites. Cry Me A River was also good, but I prefer the other ones.