You can now download both EPUB eBooks and MP3 audio books from the library's Digital Downloads directly to your iPhone, iPod Touch, or Andriod phone/tablet. With this app, you can read and/or listen to library Digital Downloads from anywhere. No computer necessary.
If you haven't used the Overdrive Media Console on your portable device, search for "Overdrive Media Console" in the Apple App Store or Android Marketplace. Existing users just need to upgrade their installed version to v2.0.
The iPhone version of the application will work on the iPad with IOS 4, but an optimized version, with improved resolution and additional features, is coming soon (along with versions for Blackberry and other mobile devices). For a complete list of compatible devices, check out this handy fact sheet