Here's an interesting little addition to the Android Market for developers: You can now upload multiple APK files for a single listing. That is, you can have one app name (and one package name), with multiple versions of the app file. Why do that? A dev could have one APK for tablets, and another for smartphones. Or one for one screen size, and one for another screen size. The Market keeps all of the same listing information -- screen shots, description, comments, etc. -- and aggregates stats and billing.
For most of you out there, you shouldn't notice a thing. But it's a nice addition for the folks working behind the scenes.
Source: Android Developers Blog