Check out these sites, search for a topic that interests you, and get to reading!
Here are some things I'm excited about reading online, for free! Of course all my selections are music related, but these sites have books on every topic, including novels.
From Project Gutenburg I'm excited about starting On Conducting: A Treatise on Style in the Execution of Classical Music by Richard Wagner
I have to be honest, I don't really enjoy reading from my computer. Some of these sites have the option of saving as a PDF and opening on a tablet or kindle. I am going to try to save a bunch to my iPad.
What are you going to read about next?