American Express is now allowing card members to apply membership rewards points to their smartphone-enabled retail gift cards, then use them to instantly pay for purchases with their mobile device at select stores.

FORBES: Gift Cards Will Be The Hot Holiday Present As Mobile Cards Gain Popularity

Once they choose a book, customers can choose to "Send to Kindle" and will be redirected to Amazon.com to login to their Amazon.com account and the book will be delivered to the device they select via Wi-Fi, or can be transferred via USB.

ENGADGET: Amazon lets you check out Kindle books from library websites, asks you to shush yourself at home

Going a bit more in-depth, a new professional solution from Sony allows broadcasters to capture side-by-side 4K video at, say, a sporting event, then use a standard camera zoom device to select small portions of each feed for 720p or 1080i output.

ENGADGET: Sony Stitch merges footage from two 4K F65 cameras to create zoomable panoramic with HD output (video)