The value of an up-vote on questions have recently been changed on Stackoverflow.com, here is the acticle with the details (now an up-vote on a question have the same rep value as an up-vote on an answer)
Is this policy coming to unix.stackexchange.com and other sites ?
That change was made network-wide, not just on SO. It's not obvious from the blog post, but there is a hint (emphasis mine):
We’re recalculating reputation for every Stack Overflow and Stack Exchange individual based on this change.
One obvious indication of it being network-wide was the sudden awarding of a number of "Yearling" badges (Why am I getting so many "yearling" badges today?).
(Except maybe Area 51, because that's an older code base - see Does the question reputation increase apply to Area 51?)
