- How to Learn Any Language in 3 Months
- Why Language Classes Don’t Work: How to Cut Classes and Double Your Learning Rate
- Youse, Y’All, and Other Confusions of Modern English
- How to Learn (But Not Master) Any Language in 1 Hour
- How to Resurrect Your High School Spanish… or Any Language
And, courtesy of Tim's blog, here's a bonus link to a good article on frequency lists: Why and how to use frequency lists to learn words by Tom Cobb.
Top 10,000 words in Dutch, English, French, and German
Word lists based on frequency of use