I'm sure that
something happened -- there are a great many flood myths throughout historical cultures, such as the Gilgamesh Epic of the great deluge. This event was probably big enough to affect many cultures throughout the Mesopotamian region, and a flood that devastated the fertile crescent is not out of the question. So far as Western writing is concerned, that would have been "the world" at the time that we traditionally date Noah as living in, so the stories are probably not out of line calling it a worldwide flood.
In terms of Noah, I think you detractors are trying to take the story a little too seriously. In the Bible, it effectively makes a point (as someone earlier pointed out that parables do), and perhaps all it amounted to in reality was a farmer gathering his livestock (maybe two of each so as to start new herds, flocks, etc.) and family into a hastily built boat in order to escape a flood, which subsequently wiped out his villiage (and possibly all of the surrounding villiages and/or most of Mesopotamia).
When the floodwaters receded, the family started afresh, fully vindicated by a powerful God who wiped out all other sinners. The ancients interpreting events in that way is not out of the ordinary, nor is it surprising that other similar stories could have come from similar survivors around the region in the form of different flood epics. That such powerful tales survived via oral tradition is hardly novel.
A literal Biblical interpretation is quite unlikely, given that there are up to 1.75 million distinct species (and likely many more back then). You all make good points -- a true interpretation of the Noah's Ark story doesn't take into account the genetic diversity required to restart populations or the farming methods that would be needed to supply such a society (or the one that apparently sprang from the remnants of Noah's family).
I've seen the evidence for archaeological discoveries, and as far as I've seen or heard, the evidence is sketchy -- both sides make claims for and against.
This, I believe is a picture of the boat or boat-shaped structure that Richius is referring to. It's doesn't exactly scream "ARK" to me, but I'm sure there's more research to be done.
And afleitch -- you said it: thank God I'm Catholic and can appreciate the story and accept that God was behind a flood without taking everything in the Bible so damn literally. The folks 6000 years ago just didn't have the capacity to describe things literally, nor did they have writing methods to write it all down till much later. A lot gets flubbed up in oral tradition.