My Ipod touch was my greatest asset during nursing school. Here is a great website to get you started! Recommended Nursing Apps
Some things I really loved: Micromedex, which is a free drug guide, and check out Medscape, lots of free good stuff. MD Ez labs is a good free lab app. I bought the Skyscape app and have lots of my school required books in there, like Tabers, Davis Drug Guide, IV drugs, lab guide etc, and it was well worth it. Nursing Central also has these books available.
I also loved my touch for recording lectures!
I have a coupon for Skyscape products, PM me if interested.