I've been a digital subscriber to Hacker Monthly for the past year or so, and have loved it. If you're not familiar with Hacker Monthly, it is based upon the popular Y Combinator news site, Hacker News.
Each month, they release a PDF, ePub, and Mobi file with a curated selection of content from Hacker News. The result is a great deal of well-written, graphically rich articles covering the world of development, startups, and the Internet.
For the next day, Hacker Monthly's entire digital backlog is available for free to anyone. It's definitely worth checking out.