I'm still busy with the quest of getting a half-decent phd thesis together, and am struggling a bit with the margins.
According to some traditional type setters the margins should be applied according to the golden cut, meaning a 2.3cm margin on the inside of the document.
However, I doubt that this mathematical calculation took the bit that goes missing in binding into consideration; did anyone bother to calculate the 'ideal' margins for a bound document? I do not have many footnotes or figures that would go in the margins.
The lenghth of the document is more or less not relevant, but I like it to look halfway decent.
I'm writing the thesis in pages'08 (uncurl your toes, LaTeX users!) - hey, at least it does ligatures and employs the proper styles for small caps, and I yet have to discover any rivers.
The main text of the thesis is Adobe Garamond Premiere Pro, 12 pts with a headers and page nrs in the upper and lower corners, resp.