Intelligent design - Creationism by a different name?

I've heard that many believe that intelligent design is creationism by a different name. However, if my understanding of intelligent design is correct, it does not deny the the big bang or evolution occurred. It does not even deny that [abiogenesis](http://en.wikipedia.org/wiki/Abiogenesis) occurred by anything but natural means. It just means that the universe exists or was created in such a state that allowed for the extra unlikely sequence of events that lead to life existing on earth and eventually humanity. Is my interpretation of Intelligent Design off base? If not then it hardly seems that it is a form a creationism, although I cannot speak for it being a illegitimate scientific theory or not. Or is this incorrect and why?