It's really easy and fun to use; I'm currently using it to learn Spanish. They have an iPhone app as well, and they have even more languages to learn (for free!) than are listed above. I highly recommend it.
<<< adjust the non-emergency emergency services number depending on your country. It probably won't work in all countries. In England we can use 111 for those things, and the police have their own phone number, find your local station's