To use on your computer, simply sign up for Dropbox and download the application to your computer. When you are finished, you should see an additional icon near your Bluetooth, AirPort and battery life meter (if you are on a Mac). It will also add an icon to your folders. So, now when you are in a folder on your Desktop, you can choose to share/store/sync the file with Dropbox.
The next step is installing the application on your phone. For the iPhone, Dropbox is great for sharing/storing/syncing photos. You can create a folder by pushing the plus sign in the lower left corner. To add a photo, click the camera on the bottom row. The application comes with an iPhone intro and a Getting Started guide. It really couldn't be any easier.
If you want to share files, go to their website
and click on the Sharing tab of your account. It will ask you to pick a folder to share with others. When a file is shared, it will sync automatically to their computer.
The only thing I should note about this application is the amount of free space you get. With a free account, you get 2GB of free space, which is not a lot if you plan on storing a lot of photo files. 2GB is pretty standard for online file sharing, and can be found on other sites such as Mozy. You can upgrade the 50 GB for $99/year or 100GB for $199/year. For Mozy, it is unlimited storage for around $55 dollars a year, but Mozy doesn't have a mobile application as far as I know.
I really like this application and I would highly recommend it for all newsrooms. The application is free and you get 2 GB free. You can use it to get information to your editors quickly as long as you just keep a few things on it, you can use these features for free!