This is so much nicer than this, especially because they provide this. Looks like B&N took a page from the Apple playbook; Amazon borrowed from Microsoft.
This is Sidebar 1. You can edit the content that appears here by visiting your Widgets panel and modifying the current widgets in Sidebar 1. Or, if you want to be a true ninja, you can add your own content to this sidebar by using the appropriate hooks.
Default Widget
This is Sidebar 2. You can edit the content that appears here by visiting your Widgets panel and modifying the current widgets in Sidebar 2. Or, if you want to be a true ninja, you can add your own content to this sidebar by using the appropriate hooks.