The Amazon Appstore Android app was just updated to version 2.3, which finally raised the maximum application size that can be downloaded over a mobile connection from 20MB to 50MB - something we've been asking the company nonstop for over a year. I understand why they set the default to 20MB, but enforcing a max, especially on 4G (Sprint has unlimited 4G, for example) didn't make sense. After all, it's my data, I should be the one to decide how to use it. Can you say "finally" a few more times? I can.
The 50MB limit still leaves that unlimited option to be desired, but it's a huge improvement.