To reward the folks who have given such helpful feedback, there is now a third option - New Look Caudata.org FLUID. What this means it hat it will adjust its width to the width of your browser. This is great news for people with monitors that don't belong in the Stone Age: the site will enlarge its width like the old one! For people still rooted in the Stone Age, the fluid version may also help you see all of a post on the same screen - it will resolutely refuse to be too wide for you. However, these "Stone Agers" will pay a small price - the area at the top of the site will only shrink so far before things start to go behind other things.
So rejoice and be merry and remember that no one who hasn't read this thread will probably ever know about it!