If you have the latest Apple iPhone 4s, you also have Siri, the voice assistant. I recently found an ebook on Amazon called Talking To Siri by Erica Sadun and Steven Sande. Even though there are so many things that Siri can do, this book describes more efficient ways of voicing a request and also reveals tips about how to make the most of the service. There are many more things that you can do other than send messages, schedule meetings and place phone calls. For only $4.99, you can learn all about talking to Siri.