A glitch can remove books from the Kindle, showing an "Item Not Available" message, but no panic needed. Delete the offending file, reboot the Kindle by long pressing the sleep/wake button, and then ...

Sluggish performance plagued fresh-out-of-the-box tablets. But the new update fixes some of the slow browser issues, says The New York Times's David Pogue, who noted the jerky experience when he first ...