Barnes & Noble has released the Android version of its Nook e-book reader (an Android-based device, natch) onto the Market. The app is similar to functionality to Amazon's Kindle, and comes with a number of free "sample" segments of books. There are more than 500,000 free eBooks, and every paid eBook has a free preview. 

Perhaps the most interesting feature of the Nook is the ability to "lend" your eBooks to other Nook users. This is a feature the Kindle doesn't have, and really gives you the feeling of having an actual book on your shelf that you could lend to a friend. 

The app is free, and available for download now on the Android Market. The QR code and download links are after the break; click on the source link for the press release. [BusinessWire]