I couldn't live without it! I used to carry a Bible around but now I carry TEN of them around. Plus, I have Bible dictionaries, commentaries, atlases, Church Fathers, the Catechism — all in my handheld. 
I can do research and study anywhere with a whole mini-library in my pocket. You can too.
Visit my friend Rennie's site and see the latest in handheld software for Catholics! He also has lots of other cool stuff for techies like me 🙂