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This singer's videos were doing the rounds recently and have got some mainstream media coverage (1, 2) and I'm intrigued to know how the effect is achieved. It sounds a little like the voice 'breaking' effect used in yodeling, Irish music and country singing, but I've never heard that controlled to such small intervals.
How is this achieved and is it something that would be possible for most singers to learn?
I don't think it's auto tune, because as @leftroundabout says, the piano would bend out of tune too.
One comment on Youtube mentioned Sideways Yodelling, which is basically like what happens when (if you're male) you're going through puberty and your voice breaks.
It can be used to make some very cool sounds. Here's a tutorial on how it's done (from 2008, which is well after autotune was being used to fix out-of-tune singing, but before the trend of over-using auto-tune as a vocal effect):
