The following links provide access to online full text books that are not copyrighted. Each site has its own special features and functions.
Check them out and see which ones suit your particular needs!

Project Gutenberg	Librivox (e-text & audio)
University of Virginia e-text center	International Children's Library
University of Pennsylvania online books page	EServer (Iowa State Univ.)
Bartleby	Library of Southern Literature (U North Carolina)
Fullbooks	Online Medieval & Classical Library
Internet Archives	Classic Reader
Complete Works of Shakespeare (MIT)	Children's Books Online: the Rosetta Project
Bibliomania	Universal Digital Library (Carnegie Mellon Univ.)