iPhone 3G is being released today. If you are submitting to the mania, or already have a (non 3G) iPhone, these web apps are for you. I'll do a version of apps from the iPhone apps store at some point. Until then, enjoy these web apps on the set or off... All descriptions are pulled from Apple's iPhone web apps site.
ON THE SET
Power Load Calculator Allows you to calculate the load on a particular circuit when certain devices are plugged in. For example, you can calculate whether or not the circuit breakers in a location can handle the lights you want to use and if not, the size of the generator that needs to be hired. This sort of thing is better discovered during pre-production and not on the day of shooting, so this calculator is very useful in that regard.
Depth of Field Calculator This tool will calculate the depth of field for a given sensor or film type, aperture, focal length, and subject distance (the distance from the camera to the person or object you are focusing on). A lower number means that a large proportion of the background will remain in sharp focus and a higher number means that a smaller proportion (if any) will be in focus.
Footage Calculator Enables you to calculate the amount of disk space required for various video codecs at varying frame rates. It offers an easy-to-use interface that allows you to quickly and easily view the required information whilst on the move - perfect for those awkward on-the-spot questions from clients.
Film Rate Calculator Calculates the relationship between film reels and shooting time. Use this calculator to work out how many rolls of film are required for a certain shooting ratio, or alternatively calculate how many minutes have been shot for a certain number of rolls. This is a useful tool for any script supervisor or producer.
Red Footage Calculator For Red users. You select your resolution, frame rate, Redcode, aspect ratio, and amount of footage. The calculator tells you how much disk space is needed. Cool.
Weather Underground The Weather Underground, now on your iPhone. View current conditions, animated radar, forecasts, and severe weather alerts. [Note: Not to be confused with the radical leftist organization of the 1960s-70s or the Sam Green documentary of the same name.]
Sunrise & Sunset This applications helps to calculate the sunrise and sunset times for each location in the world on each day of the year. Enjoy planning your next holiday, trip or photo session where ever and when ever you want to go. Just click on the location, choose date and timezone and optionally add 1 hour daylight saving.
The Weather Channel The Weather Channel for iPhone delivers current conditions, hourly and 10-day forecasts, severe weather and maps in a fully interactive environment. [Note: I prefer the Weather Underground web app's interface to this one from the Weather Channel, but some will prefer this one.]
Stormchaser Cloud Reference Chart An on-the-go webguide to common cloud shapes and patterns and what they mean to the stormchaser or weather buff who wants to predict the coming weather via cloud formations.
OFF THE SET
IMDb iPhone Client Web interface with support for looking up actors, characters and movies. The client also helps you find trailers that are suitable for viewing on the iPhone and view additional information such as: Goofs, Soundtracks, Trivia, Quotes, and Crazy Credits.
Fandango Movie Showtimes and Tickets Buy movie tickets on the go with Fandango. Access showtimes, read movie details and reviews, find theater info, and get maps - all on your iPhone or iPod touch!
Moviefone for iPhone Give us your Zip Code and we'll give you the world -- of movies. Find Movies and Showtimes near you, as well as Upcoming Releases, our Top 20 Movies list, and Top iPhone Trailers.
iNetflix An iPhone Netflix client. It will let you see your queue, whats at home, recommendations and new releases.
The Cut List The Cut List displays a list of movies from the top 100 DVDs to new releases from your favorite online movie rental store.
EDIT (7/11/08 @ 12:30): iPhone App Store is open