Evernote Stacks are one of the handiest features of both the free and premium versions of Evernote. Although Notebook Stacks have been around for almost two years, this feature still is not supported on the iPad app. I have an easy workaround!
I have been hooked on Evernote for several years now. It is by far the single most highly used app in my personal and professional information management system. I use it all day every day — on my Macs, my PC, my iPhone, and my iPad.