Interesting reading:

Let's Build a Compiler, by Jack Crenshaw
http://compilers.iecc.com/crenshaw/

This fifteen-part series, written from 1988 to 1995, is a
non-technical introduction to compiler construction. You can read the
parts on-line or download them in a ZIP file.
Read the tutorial on-line

Part 1: INTRODUCTION
Part 2: EXPRESSION PARSING
Part 3: MORE EXPRESSIONS
Part 4 INTERPRETERS
Part 5: CONTROL CONSTRUCTS
Part 6: BOOLEAN EXPRESSIONS
Part 7: LEXICAL SCANNING
Part 8: A LITTLE PHILOSOPHY
Part 9: A TOP VIEW
Part 10: INTRODUCING "TINY"
Part 11: LEXICAL SCAN REVISITED
Part 12: MISCELLANY
Part 13: PROCEDURES
Part 14: TYPES
Part 15: BACK TO THE FUTURE
Part 16: UNIT CONSTRUCTION

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Martin K.
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