An idea for an iPhone app that I haven’t seen yet would be a video camera app with built-in auto cue.
Particularly on the iphone4 when using the rearward facing camera, some configurable text can come up on the screen overlaying the picture preview which can be read back, to the camera, presenter style.
Would suit tourist style self narrated videos. ie holding the camera and recording oneself and reading off the auto cue.
Text and pace of read back can be configurable.
To make the app more useable, using geo location services / check-in functionality, the auto cue app could suggest relevant text to be read back, ie historical or local information about the site.