I've been using Anki to get fluent in Ruby and JavaScript.

See the article, “Memorizing a programming language using spaced repetition software” here:

http://sivers.org/srs

I use some super-dumb examples on that page, but I hope the points above the examples help.

Also make sure to read Piotr Wozniak's awesome “Twenty Rules of Formulating Knowledge”:

http://www.supermemo.com/articles/20rules.htm

(He's the author of SuperMemo, a predecessor to Anki.)