You can use the iPhone as a slate

It’s a prompter, a script revision tool, and it will even calculate viewing distances and angles for camera work; but now, you can use the iPhone as a slate!

iSlate is an easy to use portable digital clapper board that can help video enthusiasts add a touch of hollywood magic to their videos. Possible uses include video blogs, online video postings, and various video projects.
http://www.apptism.com/apps/islate

Features:

- Quick and easy data entry

- Open/close slate by flicking or by button

- Sound effects for opening and closing of clapper

- Option to disable open sound

- Automatic date and time entires

- Auto load of last entries

- Handles entries for roll, take, scene, cam,director, production, and cameraman

- Supports for 23.97,24/25/29.97/30/59.97,60 fps

- black or white slate

- quick take increment/decrement

- auto take increment on/off

- accelerometer on/off

- support for MM/DD/YY or DD/MM/YY date format

- enable slate logging option

- note entry to slate logs

- swipe delete of slate log entries”

Another great way to use technology to our advantage.

–Jonathan Stainton