I have put together a new article regarding whether the Global Flood of Noah is possible. It utilises a lot of information from threads on JWN, and some of you may recognise your own comments. Please feel free to proof read, make suggestions, provide further references, etc.
http://www.jwfacts.com/watchtower/flood-noah-global.php
It is not intended to be a scientfic article, but a simple summary of areas of science that prove a flood covering the highest mountains globally is impossible, hence it is lengthy but quite light reading.