As a heavy reader, I would like to heartily endorse all manner of ebook readers. Just... just get one. Your bag gets much lighter, you can keep more books around, nobody ever nags you to hurry up because they want to read it next, and most ebook readers have either wifi or 3G connectivity these days, so they can double as basic email-and-Wikipedia machines when you aren't close to a computer. (Wouldn't want to use it as a regular internet connection, but if you're just shooting out e-mails and looking up directions, they'll do.)