Amazon released Kindle app for iPhone. This is really, really cool. Now, I can read my Kindle books on my iPhone when I'm out around the city without my bag (no bag = no Kindle). The Kindle app includes a feature they call Whispersync: > Kindle for iPhone also includes Whispersync, which allows you to seamlessly switch back and forth between your Kindle device and Kindle for iPhone while keeping your bookmarks and reading location synchronized between devices. Now you can easily pick up reading right where you left off on your Kindle or iPhone.
Of course, Whispersync probably only works if I'm home in the U.S. on the Sprint network, so the sync and read where you left off feature may not always work for me.