Everything that you mentioned, and also: the relentless miniaturization. That took a lot of engineering. It's emphasized in the video linked to in the OP, but

Everything that you mentioned, and also: the relentless miniaturization. That took a lot of engineering. It's emphasized in the video linked to in the OP, but it disappears in the images linked in the response above, which are not proportional. Here's a side-by-side comparison: http://upload.wikimedia.org/wikipedia/commons/4/4b/IPod_5G-4G-mini-nano_2G-shuffle_2G-2006-12-29.jpg http://upload.wikimedia.org/wikipedia/commons/4/4b/IPod_5G-4... About iPod miniaturization, see also the iPod-in-water story: http://todayilearned.co.uk/2011/10/09/jobs-dropped-the-first-ipod-prototype-into-a-fish-tank-to-prove-it-was-too-big-by-demonstrating-how-air-bubbles-came-out-of-the-device-proving-it-could-be-more-compact/ http://todayilearned.co.uk/2011/10/09/jobs-dropped-the-first... All these years later, and with the new MBP, they're still pushing system miniaturization, flash memory, and high-res color displays. It's a straight line in some respects.