I too would recommend the ARRL book(s) as well. If not for anything, just makes a good reference to keep around. When I took my Tech classes, I had an old (Now Your Talking) book, and it just so happened to have everything I needed in it so I did not need to take notes (which I cannot really write that well anyway). I still use my ARRL books for a handy reference when I need to look something up. I used the ARRL Extra book, along with other sources, but I was told that it was the "harder" route. My father used the Gordon West CDs and book for his Extra. As everyone has said, everything is online, but I still like books, as books are always "online" even when the power is out. If anything, pick up a used book on Amazon.