Originally Posted by Void
this seems like a bit of fluff to me... are their cross server applications using subsecond time check precision? and if there are, how often are they polling NTP to maintain it? seems more than just a bit silly.
here's the full article: Official Google Blog: Time, technology and leaping seconds
When you consider the volume of traffic Google handles, having a second repeat twice could potentially cause issues. I think they just want to be more safe than sorry from what I read.