Many may disagree with me, but I personally believe that RIM is the one leaking these OS versions. It is the best way to beta test their software on the masses, especially with devices like the blackberry where RIM knows what OS you are running by simply having a constant connection with their server.
As for the 4.5.0.10, i only used it for few hours, it was killing my 8320. However, I have been using 4.5.0.18 without any issues for over a week now.
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No More Palm 
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