Overdrive Media, the company that supports many of the downloadable eBooks and audiobooks available through the Free Library of Philadelphia does an awfully good job ensuring that their service is compatible with the ever growing number of e-readers and mp3 players on the market today.  However, they don't necessarily play nicely with every device - the prime example of course being the Amazon Kindle.  However, if you are regular reader of this blog you know that a deal is in place to allow Kindle owners to download Overdrive eBooks from their public library by the end of this year.  Because the Kindle is the top selling e-reader on the market, this is really big news.  However, there are still a lot of other devices out there.  That's why Overdrive provides a thorough list of compatible devices on their website.  They also provide a list of devices that they know are not compatible.  If you cannot find your device listed on these pages, try this handy tool to test your device for compatibility (scroll to the bottom of the page).