Duolingo is Good, Free
FL recently blogged about Duolingo's Free iPhone App for Learning Spanish.
If you're goggled, there are plenty of Spanish Android Apps out there for you.
To see how its program performed, the language learning service Duolingo, founded by CAPTCHA inventor Luis von Ahn, commissioned a study (PDF) into the effectiveness of its program. The result, which even surprised von Ahn: it only takes a Duolingo user 34 hours to learn the equivalent of a first college semester’s worth of Spanish.