The reason I like this site so much is simple.
- The books are written by univeristy lecturers etc.
- There are many subjects covered.
- The books are in pdf format.
- No registration is required on the site.
- And most importantly they are all FREE (some advertising in the books but seperated from content).
A couple of my favorite titles so far:
- Law For Computing Students
- Java: Graphical User Interfaces – An Introduction to Java Programming
- Policing Cyber Crime
Go check them out.