Here's the reply I received from Christianity Today when I asked about getting Christian History mag. on iPad/Touch/Phone:
Hello,
Thank you for your interest in Christianity Today publications. We do not have this technology available yet, but are researching the best format for us to be able to offer our magazines on e-readers. We hope to have this available to our readers soon. Have a blessed day.
Pam Ferrill
Customer Support Representative
Customer Support Center
Christianity Today International
1-877-247-4787