Actually I think I closed the dead magic zone hole a while back, but they definitely should not work in a no-magic zone since...well...they're magic!There are also a few other places that they can't be used. I'm not going to say where. You'll find out if you try. *evil GM grin*Also, there's a way for GMs to block teleportation on-the-fly (for quest situations, for example) and in general, it's a good plan to coordinate with a GM if you're planning on using a Wizard's Tome for escape or similar purposes on a quest situation.Other than that, as long as you're not using them to escape combat or play Schmendric the Ox, it's generally OK to use.Oh, and the same statements apply to Druids and their branches.