Quote:
I didn't think you could change the display dpi on the Mac ?


You can't, which is kind of odd since OS X has support for, and encouraged the use of, much higher resolution icons. 10.4 actually supports changing the dpi of the display, but there is no actual interface supplied by Apple to do it. It seems to be included as sort of a preview for developers to test against in preparation for real resolution independent display in the next version.
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-Aaron