This seems to be a nice blend of physical and digital. Sketch on paper, make a photo, create a storyboard in the app.
iphone
Touch Application Prototypes (TAP). For iPhone and iPad, using Adobe Fireworks
Misc
Proto.io – Silly-fast mobile prototyping
Misc“Create fully-interactive high-fidelity prototypes in minutes that look and work exactly like your app should.”
check the details on proto.io
Adobe Proto app – A new touch app that makes wireframes and prototypes
Misc
Cohdoo Higlight – iPhone app recording user research / interviews
Misc
iConnectMIDI MIDI interface for iPhone and iPod touch
Misc
String Trio: die App für angehende Dirigenten – via @de_engadget
Miscvia de.engadget.com
Five essential iPhone apps for usability professionals | Steve Bromley’s UX Blog
Misc