Dropbox is incredibly easy and convenient to use. It's very simple, and that's what makes it great. It's simple enough for almost anyone to use. I've pointed tech-unsavvy friends and family at Dropbox with great success. It's just a folder on your computer that magically syncs to all your other computers too.

Now, there's nothing in that which justifies having a developer conference. I definitely do not understand that. But the Dropbox service itself deserves the praise it gets.