The number of people here who think hat standing from a kneeling position should be a move action is astonishing. Do you really think hat it would take 6 whole seconds to stand up from being on one knee? Or that you could cover 30 feet I. The time it takes someone to stand up? if you can drop to the floor prone as a free action, then it only makes sense that you could drop to one knee as a free action, and personally I would make standing from kneeling a swift action. Whether or not either provokes an AoO is debatable, but I would suggest that standing probably would, whilst kneeling wouldn't.
