IBM enjoyed 30 years of dominance. Microsoft 14 years. That suggests that the half-life of the value of market dominance is falling by more than 50 percent in each "age" of computing. Extrapolating from that trend, if we can call it that based on only two ages of computing, <A HREF="http://blogs.zdnet.com/Ratcliffe/?p=237&tag=nl.e622">Google in 2007 has a year or two of dominance left.</A>