Just noticed one of our development servers here in the SitePoint offices has clocked up 250 days of uptime.

Given that it's a sadly mistreated RH 6.2 GNU/Linux box which plays mp3s 24/7 as well as a number of internal database / webserver tasks and it's not even on a UPS, I find this pretty impressive!

What have your experiences with uptimes of various OS's been?