Here's how to change a file's modified date:

touch -mt 201102260000 <file>

Where "201102260000" is year, month, day, hours, minutes all glued together (so 2011-02-26 at 00:00).

Also, if you want to change both the modified and creation...

Running the risk of spoiling some things, i think i'll start with some of my favorite quotes from the live event :) Gizmodo on Jony Ive's video: "It's like saying you've been completely redesigned when you come back to eight grade two inches taller."...