Nugget - Find your perfect startup idea
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Idea Hunt - Solve specific challenges for your favorite products
Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Idealist - Volunteer, work, and intern job search
LibriVox - free public domain audiobooks