Hey you can never have enough books and they will make good reading while taking the Linux courses from yesterday. Here are a few of the titles and many more on the site.

# Advanced Linux Programming by CodeSourcery LLC
# Comprehensive Linux Textbook by Muayyad Saleh Al-Sadi
# Java Application Development on Linux by Carl Albing and Michael Schwarz (PDF)
# Linux Client Migration Cookbook, Version 2: A Practical Planning and Implementation Guide for Migrating to Desktop Linux by Chris Almond
# Linux Compute Clusters by Chander Kant
# The Linux Cookbook: Tips and Techniques for Everyday Use by Michael Stutz
# Linux Device Drivers by Alessandro Rubini and Jonathan Corbet
# Linux Installation and Getting Started by Matt Welsh
# Linux Kernel Module Programming Guide by Ori Pomerantz
# Linux Network Administrator’s Guide by Olaf Kirch and Terry Dawson

Peruse the rest of the list