Android: The Kindle app for Android now offers more of the functionality Kindle fans have come to expect, including the syncing of notes, highlighted phrases, full text search throughout e-books. More Android-specifically, you can search for a phrase using your voice.
Microsoft has released a free — and lengthy! — e-book covering a wide range of security topics. Although intended for teenagers, the book offers a solid enough look at using the internet safely, and it’s suitable for anyone who needs a primer on internet security.
There are loads of free audio and e-books available online for the taking, but tracking them down across their many sources can be tough. Web-based search tool Librophile makes the job a lot easier.