I also have not seen tasks fail to run, but I found this thread:
 
http://stackoverflow.com/questions/5583813/google-app-engine-added-task-goes-missing
 
Specifically, the part that says: "Tasks are not guaranteed to be executed 
in the order they arrive, and they are not guaranteed to be executed 
exactly once. In some cases, a single task may be executed *more than once 
or not at all*."
 
I haven't seen the behavior myself, and perhaps the commenter is not 
correct, but it occurred to me that I need to account for the 
possibility. I believe I will have a status flag a la Per's 
suggestion. Thanks!
 
-Richard 

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