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 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?
There are young earth creationists and old earth creationists. Young earth creationists tend to literally translate the opening chapters of Genesis as a literal 6 day creation cycle and an earth approximately 10,000 years old.

Old earth creationists will generally meld evolutionary theory with with looser interpretation of the opening chapters of Genesis.

Both creationist beliefs state the spiritual source is the God of the Bible.

Intelligent design advocates don't specify where everything started or who started it. They just say there's a point at which matter must have begun and before that there's something non-physical that must be the source. Also, they'll argue that the order we observe in nature speaks to something will intelligence directing evolutionary or creationary forces.

In a way you could say Creationism is a sub-set of Intelligent Design, and Young earth/Old earth creationist are the two primary sub-sets of creationism.