ServerFault:
[windows][xp]
-> [windows-xp]
(24)
[xp]
-> [windows-xp]
(57)
There's also
[vista]
(297) -> [windows-vista]
(48)
so I guess [vista]
should win, but this is inconsistant with [windows-xp]
and [windows-7]
... (perhaps this is where synonyms would be great)