So far, Intel architecture has been the major de facto standard for CPU architecture. If you were using some other minority architecture, you had an Apple or something really obscure. HP Announces ARM-based Servers HP may be transitioning away from Intel processors. How well that works out remains to be seen. If they get good sales from their ARM server line, this could bode ill for x86, IMHO. With Apple apparently charting a convergence of iOS and Mac OS X, it may not be long before the A<x> processors start migrating into notebooks, and thence non-portables. Energy use has become quite significant. With powerful GPGPU chips to boost performance at minimal energy cost, I can envision even Windows moving toward ARM.