I have created a web based e-commerce site for a client a while ago. Was quite impressed to notice today that machine I have built using Gentoo linux and JBoss for the AS has been running for more than 500 days now:

dXrTle ~ # uptime
17:45:02 up 503 days, 1:36, 1 user, load average: 0.01, 0.02, 0.00