Along with the usual student things, lots of extra black pens are a must for placement as they often go missing!
I've found that as well as a good diary, a big year planner that you can stick on your wall is really helpful. I've found it helpful so that at a glance I can know when I'm in blocks of uni, on placement, study time or annual leave etc. I also highlight hand in days etc. My nursey friends and I have found that one of the key's to surviving nurse training is to (try) to be organised!
Another good thing to take would be an eye mask and ear plugs for when you're on night shifts and needing to sleep during the day. You'll probably find your own way of sleeping when on nights, but I've found that an eye mask has really helped me.
On the same lines, a good loud alarm clock is a must (or possibly 2 or 3 alarm clocks!) for early starts (unless you're a natural morning person. I am not)
Someone above said that vitamins would be a good thing to take, and I definitely agree. They make me feel a lot better!
In terms of books its probably better to wait till you start. However a really good book to read is The Student Nurse Handbook by Bethann Siviter. Its got loads of really good advice and has helped me and my nursey friends very much.
Good luck with starting your training!