Last fall, I downloaded Kindle for Android. Honestly, I didn't think I would like it...thought the screen size would be too small on my Galaxy phone. Turns out, I love it! Besides, I like carrying books with me everywhere. You never know when you'll have time on your hands: the doctors office, getting the oil changed, etc. - so you can spend time in a good book and avoid the stale magazines in the doctor's office.
Now Barnes & Nobel is offering a free download of their popular Nook for iPhone, iPad and Android. With that free download, you get a $5 credit toward the purchase of an ebook.
I downloaded Nook to my personal computer a few years ago mainly to check the formatting of my books. The app works great, so give it a try. Go here for the free app: http://bit.ly/1Ofd0uO