Owen : I guess the pdf file is the best idea for now...
JMW : fonts in toshop are pixelized, meanwhile in illustrator they're vectorized. This is a huge difference regarding printing issues, pixels are cubes of a fixed size, vectors are only directions interpretated by the software which makes you able to resize it at wil without losing quality. Anyway, to print a book, it's even better to put the text after in a software like "Indesign" or "Xpress", all the pics should be .jpg or .eps, 300 dpi CMYK, sized with bleed. Print this in .pdf with the settings of the printing company you're working with then wait for it to come !