Seven Languages in Seven Weeks
For each language, you’ll solve a nontrivial problem, using techniques that show off the language’s most important features. As the book proceeds, you’ll discover the strengths and weaknesses of the languages, while dissecting the process of learning languages quickly—for example, finding the typing and programming models, decision structures, and how you interact with them.
Intriguing.
And I’ve only really dabbled in one of the seven!