Project Gutenberg – Free ebooks online, includes classics, random old, old, old books, and all kinds of interesting finds here.
Open Library – An online public library of sorts. It’s awesome.
LibriVox – free audiobooks
Just Free Books – search portal to find all sorts of free books online in various formats
Answers in Genesis for Kids – Creation Science articles for kids
Storyline Online – books read aloud by Screen Actors Guild members
Highlights Kids – the magazine, online
Children’s Books Online – From pre-reader to adult