Currently, all my books are available on Amazon Kindle. Plus, Emerald City Dreamer and Recovering Agency are both in print! And Recovering Agency is available on most ebook platforms, including Nook, Kobo, and iBooks.
Amazon has made their Kindle app available on most platforms. My preferred platform is my Android phone. It is always in my pocket, so I can grab a quick read wherever I am. And the smaller form-factor is the perfect size for reading.
Whatever your device, there's probably a Kindle app for that.