We know that Textmate made it very easy to install a plugin by downloading it and double clicking on it. Maybe Sublime can do better.
How about a centralized plugin repository that allows users to easily find/install/remove/update plugins from within the editor.
Centralized repositories proved to be a very good thing like ruby gems and apple app store.
It just makes it easy for the user to find plugins that can be trusted and easy for developers to make their work easy to find.
It also enhances security because these scripts can be pre-vetted to make sure they’re safe.