Good news ebook fans: Amazon’s Kindle app for the iPhone is now available in more than 60 countries.

Amazon launched an international version of the Kindle back in October, but now users can link their Kindle books with their iPhone or forgo buying the Kindle and just read the books on their mobile phone.

Amazon employs a technology they call Whispersync with the Kindle that keeps the bookmarks and last pages synchronized across different devices on the same account. It also means that if you accidentally remove a book from your iPhone, you can redownload it on the fly.

Amazon’s Kindle app [iTunes lin]) is one of the best e-readers for the iPhone, regardless of platform. It’s easy to navigate, has adjustable settings for text and background color, and you can enable or disable the accelerometer (which is handy for anyone who likes to read in bed).

Using the app, you can buy books directly from Amazon.com and download them to your device, or sync with purchases you make on a Kindle or via the web browser. Amazon recently released Kindle Desktop software for the PC, and a Mac version is in the works.

Amazon also says that Kindle for BlackBerry is on the way, too. Since launching the Kindle in 2007, Amazon has watched the competition in the space go from nearly nonexistent, to more and more crowded. Competitor Barnes & Noble just launched their own eReader, the Nook, which also has its own iPhone app.

We think that the free Kindle iPhone app is the best advertisement Amazon can make for the Kindle itself. It’s extremely easy to buy and read books, and after you start to amass a small library, that can play a large factor in what standalone eReader you buy.

Tags: eBook, ereader, iphone, Kindle, kindle iphone, nook