Often, the authors of youth novels write stories that are relatively depressing and lacking in any conclusion. 
This is done to add a realistic edge to their story. They often do this by exploring the ugly side of people and society; this results in a de-motivational but realistic story. It is rare to find a non-depressing yet realistic youth novel. That is why I am in luck.
In “I am the Messenger” the author explores the beauty of humanity and society. This is a story about the difference that one person can make and multiple lives just by caring.
The story follow the protagonist Ed Kennedy a 19 year old cab driver whose life is changed after a bank robbery. Soon, he begins to receive tasks to deliver no physical messages. Right away he beings to question who is sending him these tasks, but it did not take long for him to realize that refusing to deliver a message is not an option. For Ed, figuring out what the message he must deliver is, may be a more difficult task than delivering the actual message.
Markus Zusak is a phenomenal author and I am the messenger may become one of my favorite novels of all time. This is a highly motivational novel that remains realistic, though it does have very suspenseful parts. This is one of those stories that just makes you feel good afterwards. I recommend this novel to anyone 14 and over.
You are right about Marcus Zusak–he is totally awesome. You know what I've found-that a lot of australian Authors are amazing! Shaun Tan, Melina Marchetta, Marcus Zusak…the list goes on. This is probably a dumb question, but ever read "The Book Thief"?
thanks for the list, i just wrote down the names you've listed. and the answer to your question is yes, and i believe i've wrote about that book on a previous blog post. the book thief is truely amazing in my opinnion.