Based on Big John's Piefecta
This center col is first in the source and is floated right. The left col (second in source) is floated left in the same wrapper.
The headings and paragraphs are widthless and have 1px red borders to show any width problems in the columns.
Any column may be longest. All the columns are floated.
This is a test link.
This col is left floated and also negatively margined to the left, so it is pulled out of its container except for a single pixel that is kept within the container.
This layout works in: IE5+/Win, Opera 6+, Mozilla, IE5/Mac, Safari.