I spent ages folding of the net, I didnt get my first book for ages, I was doing three star models online before I got a book..
Obviously it has its good point (its free

) but, diagrams in books tend to be a bit more professional.
Overall I think I learned most of my origami on the net and just perfected the books, now I have loads of books but I still look at lots of models on the net, there are some great ones out there.