the theater you bought tickets to has to be able to scan mobile tickets, did you check to see if it does? i use fandango at my main local theater which has it and when i buy a ticket on fandango it asks if i want to send it to passbook. you don't have to send it to passbook anyway, they can scan it right from the fandango app. one other thing: it says on the FAQ that they don't charge extra, but somewhere somehow i pay $1.25 extra per ticket for mobile ticketing so i personally have to have a good reason to use it.
http://www.fandango.com/faq/MobileTicketFaq.aspx