Holy shit..

[Joe]

http://counter.li.org/reports/uptimestats.php

Five years and two months! However.. was 2.6 even out back then? Perhaps it lies. But wow, that's neat!

[Ergot]

According to the data modified time on kernel.org 2.6 came out December of 2003. I'm guessing the one you're looking at is "1892.1     2.6.4-52-smp     Intel Pentium III" the 2.6.4 kernel was released in March 2004.