I'm not sure you'll really be able to find many of those answers. This forum was update not to long ago, thus many of the oldest posts may have been deleted. If there were saved they many not contain the images that accompanied them. This said, the oldest thread I found (pertaining directly to showing ones artwork) was from 03-20-2006, 01:51 PM.
The Gallery (not the gallery forum, but the "Gallery" itself) was started just a few months ago, after the forum update. Though I don't see any way to search the Gallery by date, which is sort of odd.
Nothing is easy to the unwilling.