On servers. A lot of servers. Everything else (well yes, everything including RedHat, SuSE, *BSD, Solaris and of course #@!dows, except maybe Ubuntu LTS) is just a nuisance. You want them to work, and you want them to have all the necessary security-patches, but you don't want to fuss over them every day.
Otherwise, on my workstation and notebook, I use "unstable".
A constantly usable testing distribution for Debian
Posted Sep 24, 2010 18:04 UTC (Fri) by giraffedata (subscriber, #1954)
[Link]
A lot of people also want their desktop and notebook to work without fussing over them every day, so run Debian stable there too. I do. Once, I found I wanted some features that were too new to be in Stable, but I decided to wait a year rather than risk a maintenance headache.
Rackspace rents virtual machines running any of about a dozen Linux OSes. Stable is the only Debian option it offers.