'You haven't explained everything yet' is not a competing hypothesis

Nice op-ed piece on ID in the NYT by Dan Dennett entitled Show Me the Science. Key paragraph:

In short, no science. Indeed, no intelligent design hypothesis has even been ventured as a rival explanation of any biological phenomenon. This might seem surprising to people who think that intelligent design competes directly with the hypothesis of non-intelligent design by natural selection. But saying, as intelligent design proponents do, ‘You haven’t explained everything yet,’ is not a competing hypothesis. Evolutionary biology certainly hasn’t explained everything that perplexes biologists. But intelligent design hasn’t yet tried to explain anything.