SkepticReport * The Whole Silly Flood Story goes through several critiques of the Genesis Flood story.
This is to most people a completely unnecessary exercise. Most folks do not take the Genesis story literally, even if they are themseleves religious, and therefore do not need to look at it scientifically. Unfortunately, the creationist-types, who are quite abundant where I live, make the Flood a keystone of their geology, and by doing so invite attacks like this. Their reaction will always be that folks like the Skeptic report are "anti-religion" (well, probably so), intolerant, and discriminate against Christians.