http://www.goblinparty.com/solstice
The default size for movabletype's one-column body is pretty good if you're running a blog, but I want full-size images to display in it, some of which may be as wide as 800 pixels. I can't get the body to be that wide, even if I manually edit the CSS. After a certain point, it gets stuck at that image-croppingly tiny size.
Is there a way to make the column wider?

Zeltaen, add the following to your css and modify accordingly example
alpha {width: 800px; }
alpha-inner {padding: 10px; margin: 10px; }
those are ID's btw, so you need to preface them with a number sign (#)