Getting lots of data onto and off of the iPhone

Suppose I write a program for the iPhone that does audio or video editing, or anything else that creates large files which users will want to move to their computers; or users might want to move large source files from their computers to their phone for use with the program. What are the options for doing this? I can think of 3 ways:
1. Use web access to upload and download files. This could be time-consuming for the user and expensive for the app developer if users are going to be sending potentially gigabytes of information to and from my server.
2. Build a desktop program that has its own web server, so users can connect to their desktop directly from the iPhone app, as long as they have wi-fi at home; but making it cross-platform would involve a lot of extra work.
3. The best option I can think of would be to implement an AFS, NFS, or SMB server in the app, which would allow the computer to mount the iPhone as a share -- but specifically only the files in that application's data store. This would be awkward (without background processing, the user would have to leave the app open while accessing it from their computer) but it should work, and it doesn't appear to run afoul of Apple's SDK agreement. The question which I haven't looked into yet is: is it possible to open a TCP port to listen for connections on the iPhone, or only to make outgoing connections?
4. Conversely, an AFS client in the app would let users connect to their desktop computer to pull files, but this seems less convenient.
Can anyone think of other options I might have missed, that would make transferring large files less painful?
(The obvious right answer would be for the phone to act as a USB drive when connected to the computer, as most iPods do, so that files could be easily copied on and off. The next best thing would be for iTunes to provide an option to sync third-party app data along with its own data, but I can't see any way to do this either.)
<Edited by Moderator>

if users are going to be sending potentially gigabytes of information to and from my server.
If your users are going to try to do anything with gigabytes of information and the phone you have giga-problems. You might rethink what you're trying to do. There is VERY limited memory on the phone (20-30MB reasonable). The phone runs at 1/4 speed or less than the typical desktop system.
You've outlined the main ways. Buy/download some of the file sharing or transfer type of apps to get a sense for them and their speed.

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Graphics NVIDIA GeForce 9400 256 MB
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Please post your results
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JasonFromSK wrote:
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AC

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tt2

Getting lots of data onto and off of the iPhone

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