It should be simple for you guys to reproduce this.
It's all started with stonebridge remix of show me love.
http://www.youtube.com/watch?v=BHnMFExQbyI
(starts on 0:35)
then several house producer starts reusing this:
specially in this one:
http://www.youtube.com/watch?v=Uvz6mF3ZLwE
(starts on 0:43)
david guetta - delirious - laidback luke remix
Thanks