EXC_BAD_ACCESS error

This error message from the console;

Program received signal:  “EXC_BAD_ACCESS”.

is typically thrown as the result of an illegal memory access, like trying to access a deallocated object or sumthin. Try using the NSZombieEnabled feature.  This will tell you which memory address is deallocated, actually where it was set.
-[PostCard postCardLeft]: unrecognized selector sent to instance 0x347c70

You can then use the Debugger to track it down

[[[      alloc]   init]   retain] can be used  sometimes to keep a variable around