I went to replace some hardware on a Linux server I had running here at the house, which happened to have Tao Linux 3 running on it, and sadly that mean bringing down a box that had 400 days uptime on it.
Upon rebooting it, I noticed that Grub listed a Centos kernel as the default to boot. This was very perplexing to me, until I realized that (1) I had automatic Yum updates turned on (because this is a box I don't want to admin too much) and (2) The Tao project has basically given up the contest to be a RHEL clone because of time constraints (thanks for time you did give us, Tao developers!) and they put in place mechanisms to cause Yum to "switch" a Tao box to Centos automagically.
I should've caught this earlier, given that I've got tripwire and afick running, but I must've missed that one day when the yum.conf changed :p
No big deal, really, as I was planning to upgrade the box to Centos 4 sometime soon, but boy was I confused for a minute there!