Reader Aleks Enne sent us a link to a new Keynote file he created for users to build iPad app mockups using Keynote. Since the file isn’t an official “theme” you don’t have to find a way to install it, just sync it to your iPad and open it with Keynote.
The file (at the point when we downloaded and opened it) contains 7 slides, with items such as the unlock screen, the home screen, the onscreen keyboard, various interface elements and even a page of instructions. The amount of interface elements is pretty large for a freebie, so you might want to send Aleks an email thanking him for his hard work.
You can download the file here, as well as read a bit about why he created it.