PZ Myers was interviewed about Ray Comfort a few weeks ago on WDAY radio. PZ brought up the fact that many people are unknowledgable enough to believe what folks like Ray say, and therefore people who know something about evolution need to take time to have a "point and laugh" session in which we expose how crazy people like Ray Ray and Quirky Kirk Cameron really are.
Contrast this with Richard Dawkins' and Stephen Jay Gould's view that creationists should not be given attention because it merely gives their views credence. It allows them to say that there is a "controversey" going on and makes outsiders think that there must be something to the creationists' views.
We need to strike a balance between these two views. Creationists like Dembski and Behe should be ignored for the most part because their arguments (Excluding CSI and Irreducible Complexity) are sometimes so technical that regular creationists will not use, much less understand, their arguments. For example, the central thesis of Michael Behe's last book was that two protein protein binding sites were required in the evolution of certain molecular "machines" and therefore we must invoke design. In hindsight, there was no point in anyone rebutting this argument because no creationist besides Behe is using it! If anything, all the reviews of Behe's book probably drove his sales up.
But what about the young earthers? Their claims are widely believed perhaps because most people don't know how to counter their claims. Combine this with the fact that many evolutionists like myself are easily frustrated with them, and can even sound condescending at times.
I think three steps need to be taken to combat this problem:
1. Discuss the arguments creationists have without being condescending, and rebutt them in a friendly and easy-to-understand manner.
2. Explain the very simple yet profound predictions that evolutionary theory makes, and how they are confirmed. For example, if scientists predicted that a "missing link" between fish and amphibians would be found somewhere between the rocks fish first appear in and the rocks that amphibians first appear in. Sure enough, a beautiful transitional fossil was found: Tiktaalik. Point out that the first amphibians looked very much like fish, just what we would expect if they had evolved!! And that is not the only fossil bridging the fish-to-amphibian gap either. Acanthostega, for instance, had lungs and gills. The Devonian Times lists many other such transitional fossils.
3. Realize that creationists hold onto their beliefs for emotional reasons, not scientific ones. A good way to combat this is for atheists to speak up: Talk about the cruelty and absurdity of hell. Mention the fact that even if the wonderful "design" of the world is improbable, God would have to be even more complex and therefore more improbable. You can have religion without creationism, but you can't have creationism without religion.