Also we could have a javascript function which zooms the content to the width of the current screen.
Apple behavior (apple-+ modifying font size rather than zooming) does make the "just zoom it" approach less trivial though.
The reason I suggested a non-liquid layout for Context garden is that, in my opinion, the normal wiki / liquid text style reflects poorly on a project which promises beautiful typography.
For an example of additional precedent for this approach, the Textmate wiki is also a fixed width layout:
http://wiki.macromates.com/Main/HomePage