This is the initial list. It will contain links to the Wizards of the Coast threads until I move each one over and correct the link to point here. If it's already been moved, I've put it in BOLD.
[Editors Note: The second Druid guide, titled Lunar Wilds, contained almost nothing and was almost totally incomplete, so I am not moving that over. I will, however, make a note of his few comments in the Circle of the Moon handbook thread]