What's a good Android app for accessing a wide range of e-books and digital magazines, especially one that allows me to purchase and manage my digital library across devices?

The Barnes & Noble app presents an interesting implementation of a digital storefront and reader. I find it intellectually satisfying that I can purchase content on my tablet and then access it seamlessly on my phone. This is particularly helpful for academics who need to access research materials on the go. The ability to manage your digital library, including purchases and downloads, is also a well-researched design. While the interface could use some refinement, the core functionality is pedagogically sound. The ability to highlight text and add notes is useful for research scenarios, and the cross-platform compatibility is a definite advantage. The algorithm for suggesting new reads is surprisingly elegant and often introduces me to authors I wouldn't have found otherwise. It's a novel approach to an old problem, and I appreciate the thoughtful curation.