A 63 slide deck may seem long but the short captions and descriptive pictures make this a very useful presentation. Lots of new ideas and some great reminders of the things we know we should be doing more often. Bravo!
I saw this the first time it was submitted - http://news.ycombinator.com/item?id=1318781 - but I don't think the significance of slide 39 hit me then. It shows a simple home page in an early beta, which Dropbox then figured still wasn't simple enough.