I'm not entirely sure, but you might be able to find a PDA with study guides for your pre-reqs, such anatomy & physiology, and chemistry helps. Is this what you are talking about?
I, for one, LOVE PDA's. Just last week I was drooling over one in Comp USA. That's the one I'd probably get (Palm LifeDrive). It had 4GB of memory. That'd help any nursing student. I have a CHEAP one now that I'm eager to replace, but I'm waiting for school to start or closer to school to buy one.
I LOVE new technology. I'd also love to have a cell phone camera, but that's a different topic.

Good luck and I hope this helps!