When Is A Px Not A Px?

Dave Hyatt just put up a fascinating post about the future of web design, browsers, and high-DPI displays.

It seems to me (having just spent a large amount of money on a new monitor) that we’ll be seeing much higher resolution displays in the near future. GUI interfaces really only became useable when graphic standards moved to about 72 dpi (which was the resolution of the original Macintosh). Today the average 17” CRT is set to about 100 dpi, and many people use higher resolutions. The advantages are obvious—better anti-aliasing, crisper images, and so on. The technology may even make its way to HDTV sets—the extra pixels could easily make large screen even sharper than they are.