In a previous team, thinking about how to manage the resizing of thousands of photos automatically and intelligent was central to what we did. Of course if you automatically resize, you basically can only set a target for one dimension and have to exclude images whose aspect ratio will not fit into your target template.
This video represents an extraordinary breakthrough in that area and one that I have no doubt will be part of Photoshop / Picasa and hopefully GIMP in no time at all. This is great innovation and we will all be printing off holiday photos using this in the next couple of years.
As for the early and easy ability to erase objects from photos - amazing if not a little scary. See for yourself at: http://www.youtube.com/watch?v=6NcIJXTlugc.