A high-definition tablet -- consider the Google Nexus 10 with its stunning 2560- by 1600-pixel display -- is a great platform for digital magazines with full-color pages and beautiful photography. Digital mags often include interactive features not possible in print too. Zinio is a free magazine app that provides access to thousands of global titles, most of which aren't free but still reasonably priced. (For instance, an annual subscription to Bloomberg Businessweek costs $16.) Zinio for Android tablets has some nice perks, including an Explore section with hundreds of free articles. An honorable mention goes to Google Currents, another free magazine app worth checking out.