Improving Application Manager? Easy:

0) Make it FASTER!

1) Add checkboxes at each app, to install/remove many apps in one go. Currently I need to install them on by one, where waiting for the application list to reload takes the most of that time! It's extremely slow.

2) Browse packages by repository (mentioned before), or at least add a source repository information in package details

3) More helpful error messages. Currently I have few packages to update, which I cannot actually update, as Manager shouts at me with some kind of conflict / contact the author error. Not very helpful.

4) Better UI layout. Currently in 'Browse installable applications' section there are buttons with names, which is not very convenient, and I end up browsing 'All' anyway. I'd go for some kind of structured tree or such.

5) Actually, porting Smart or Synaptic as default package manager would be quite nice idea ;)

6) Browse updated packages after refreshing repositories. Currently Managers asks me if I want to refresh app list, I tap Yes, but.. I don't really know what's new.

7) Avoid duplication of repositories when adding a new one.