I just had a customer ask if our e-books on Overdrive would work on a Kindle.
According to the Overdrive page http://www.overdrive.com/resources/drc/compatibleebookdevices.aspx the Barnes and Noble Nook, Kobo eReader, Pandigital Novel, and Sony Reader will work on the ePub and PDF e-books.
There is also a list of devices that will work for the audiobooks. See the webpage: http://www.overdrive.com/resources/drc/compatibledevices.aspx