If you use a Mac i create a app for you. It’s very simple. Don’t need to use lines in terminal.
RPi-sd card builder v1.2 (updated)
-bugs reported removed
-Now you have to select a .img file. not the .zip like the old version
i tested in Snow Leopard(10.6) and Mountain Lion(10.8).
RPi-sd card builder v1.1
error that caused the app break at the start corrected.
How the app works?
- Run the app.
- Select the operating system distributions (.img file).

- You will prompt whit this. After you connect your sd card press continue.

- Now you have to select your sd card. BE CAREFUL, see the name and select ONLY one sd card.

- Now the program will need administrator privileges. insert your password.

- Confirm that your sd card has been unmounted. When you confirm that, press continue. (this can take a while).

- And that’s it..now you can connect your sd card to your raspberry pi…

If you like or have problems leave a comment.
If you have some problems with this app please comment and let me know what is your Operating System and in what step the program crashes.