In addition to Amazon's navigation menu promoting its digital properties ahead of the core business... notice anything interesting? It features dynamic taglines for three of the core properties: - MP3s & Cloud Player: 16m available songs - Cloud Drive: 5gb of storage - Appstore for Android: the free application of the day
For Amazon - the smartest online merchandiser / promoter - it is clearly an intentional decision to promote only three categories: new, growing categories in highly competitive areas. Amazon could off course feature deals of the day in other categories - but by doing so, it crowds the menu and creates too much noise / distraction in the menu... perhaps most importantly, those core categories are already successful, sturdy and well-trafficked. This is not true for the music, cloud and app businesses.
As you think about navigation across your site / experience - this is an example of less being more and the impact a few pixels and a small tagline can make.
