Do you want to share a book you have scanned, or written, with the Internet Archive and make it free for anyone in the world to read?
Here are step by step instructions (with pictures) of how to prepare and upload your public domain book to the Archive.
For the more advanced (or more obsessed) reader, I also give "Tips" that reveal tricks for getting the most out of your uploading experience.
Update: added a quick links section for returning readers.