Simon Janes duolingo.com is totally awesome and worth your time.

Martijn I have tried it, and a few apps like it, an none of them work for me. I need to be surrounded by a language to pick up on them, and no app or book is ever going to give me that.

Mark Dain Back when I had enough time, I was learning German and I got a handle on spelling, pronunciation and a few hundred words. Amazing app! I'm glad to see the incubator; they're adding loads of new languages like Hungarian