[Ken Case]

On the iPhone, the top of a long list is much easier to access than the bottom, so we try to place the items you're most likely to be interested in at the top of the list rather than the bottom. For a list of completed items, we assume you're more interested in looking at the items you recently completed than items you completed a year or two ago.

On the Mac, it's fairly easy to get to the bottom of a long list (just grab the scrollbar, or press the End key), so we leave them all in ascending order.