sounds like what pdfs came from. and i'm kinda surprised that you haven't migrated this way yet. but you definitely have my interest perked, so i'm going to de some research on this one.
-edit-
just googled, and the
first thing i got was apple. if your client has os x 10.4.3 or greater, they can view and print multi page tiffs. so we need to know what version of os x they are using.
and here is a site about tiffs with
list of some apps.