Here are some useful books for people doing computational research in linguistics.
A detailed introduction to and explanation of the Unicode standard.
Unicode Standard, Version 5.0|
The Unicode Consortium
The standard itself, worth having in print form if you do much work with Unicode.
Fonts and Encodings|
A detailed explanation of current font technology, with descriptions of common encodings.
Mastering Regular Expressions|
A thorough discussion of regular expressions, including several common notations and tips for optimization. Not for novices.
Analyzing Linguistic Data|
R. H. Baayen
An excellant introduction to statistics useful in linguistics using the free software package R.
Text Processing in Python|
A good introduction to text processing in Python. The examples, however, are more of interest to programmers than to linguists.
Finite State Morphology|
K. R. Beesley & Lauri Karttunen
An excellant explanation of how to use the Xerox Finite State Tools, with realistic examples.
Phonetic Data Analysis|
An introduction to the methods of instrumental phonetics including field methods.