Intelligent design suggests that the complexity of the universe cannot be explained by evolution alone, and must also be attributed to a creator or supernatural being.Kairosfocus at Uncommon Descent takes issue with Hamby's portrayal, which is indeed a little misleading. It implies, for example, that ID is an argument from ignorance, an argument which asserts that since we can't explain the complexity of life therefore life must have a supernatural provenience. It also implies that ID is a religious hypothesis that invokes a God of some sort as the explanation for life. In fact, neither of these implications is correct.
Kairosfocus directs us to a much more satisfactory explanation of intelligent design at the New World Encyclopedia:
Intelligent design is the view that it is possible to infer from empirical evidence that “certain features of the universe and of living things are best explained by an intelligent cause, not an undirected process such as natural selection”.In other words, it's not that we can't explain complexity and must therefore conclude there's a divine creator. Rather, it's that the world manifests properties which, in our experience, are produced only by minds. One of these is the specified information found in DNA which is in many respects like computer software. Randomness and unguided chemistry don't produce the kind of specified complexity which constitutes semantic (meaningful) information and which we find in living things. Only minds, as far as we know, can do that.
Intelligent design cannot be inferred from complexity alone, since complex patterns often happen by chance. ID focuses on just those sorts of complex patterns that in human experience are produced by a mind that conceives and executes a plan. According to adherents, intelligent design can be detected in the natural laws and structure of the cosmos; it also can be detected in at least some features of living things.
The Encyclopedia goes on to give a more detailed description of ID:
Greater clarity on the topic may be gained from a discussion of what ID is not considered to be by its leading theorists. Intelligent design generally is not defined the same as creationism, with proponents maintaining that ID relies on scientific evidence rather than on Scripture or religious doctrines. ID makes no claims about biblical chronology, and technically a person does not have to believe in God to infer intelligent design in nature.Perhaps nothing is more often mischaracterized in the popular press, or by its sophisticated despisers, than is the theory of intelligent design. It might be useful to bookmark this brief summary and consult it the next time you come across a story on ID.
As a theory, ID also does not specify the identity or nature of the designer, so it is not the same as natural theology, which reasons from nature to the existence and attributes of God. ID does not claim that all species of living things were created in their present forms, and it does not claim to provide a complete account of the history of the universe or of living things.
ID also is not considered by its theorists to be an “argument from ignorance”; that is, intelligent design is not to be inferred simply on the basis that the cause of something is unknown (any more than a person accused of willful intent can be convicted without evidence). According to various adherents, ID does not claim that design must be optimal; something may be intelligently designed even if it is flawed (as are many objects made by humans).
ID may be considered to consist only of the minimal assertion that it is possible to infer from empirical evidence that some features of the natural world are best explained by an intelligent agent. It conflicts with views claiming that there is no real design in the cosmos (e.g., materialistic philosophy) or in living things (e.g., Darwinian evolution) or that design, though real, is undetectable (e.g., some forms of theistic evolution).
Incidentally, Bachman's opinion on teaching ID in schools sounded pretty reasonable to me.