Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The best explanation of parsing without Greek ever.

I'm a great fan of the first edition of this book(circa 1980). It explains the mechanics of parsing ratherthan just throwing a lot of math and proofs at the reader (e.g. Aho, Hopcroft or Ullman). You come away feeling that you could actually write a compiler. One caution: the figures in the first edition contained many errors. Let's hope they've been fixed in the new edition.