@Youversion is basically the Holy Bible in whatever version you prefer developed by Lifechurch.tv . There are several audio versions available as well. The app is very streamlined and has had years of quality development on most popular smartphone platforms. Youversion offers several reading plans as well as a note making and marking feature. Connect with Facebook and Twitter and you can easily share verses with all your friends. Look and see what others are posting about a particular verse or passage and get insight into the text. Several versions are available to download for offline use as well.
I must say it's very awesome being able to switch back and forth quickly between Bible versions to delve deeper into the text and get nuances you wouldn't get by simply reading one version. Also nice to carry several versions of the Bible around with me in my pocket.
Head over and check them out online at youversion.com