If you don’t have Dropbox I suggest you download it now. I’m about 15 months into using the free file exchange service (up to 2GB, then you pay more) and it’s by far the cleanest and easiest to use. It works by running in the background of your computer and acts like just another folder on your desktop. Drag a file there and Dropbox will copy it. Want to share a file? No problem, just move it into the public section and create a weblink for any and all to use, or simply share a folder with a fellow Dropbox user.
Now the FTP like program has officially hit the iPhone. Just like the desktop program you can access any of the files in your Dropbox, but the mobile version takes it a step further allowing you to record videos and photos directly, yes directly to the service. Just select the folder you’d like to save the photo or video to, hit the camera button and you’re in business. To share it you simply hit the ‘email’ button and the Dropbox app will automatically generate a link to the media.
If for some reason you don’t have access to WiFi or a cellular connection and need access to a Dropbox file you can download it locally to your iPhone by selecting the favorites button. And if you share that file with someone, and happen to download it locally, the app will also prompt you to sync with the latest version, insuring that you’re up to date before, say, that big presentation.
The Dropbox iPhone app and service is free and available right now.