Living Album's simple interface lets you browse for graphics on your hard drive and add short captions and descriptions for each one you select (your online album can contain up to 108 images).
Google's new Android Market web store is a pretty awesome and simple idea in theory -- browse and buy apps through the web, hit install, and watch them appear on your Android phone or tablet.
You can easily browse through you entire collection of books thanks to the simple and intuitive user interface, that let you also visualize book categories for better management of your library.