Here are some of web sites for you to check out. I am a member of NANN and ANN. I find that AWHONN is more oriented to the Labor and Delivery nurses but is another very good organization!
All three organizations have their own journals which are full of relavent, up to date, research-based information which is incredibly important for nurses to keep current with to do their best job possible. Nursing is not a job where once you graduate that all the learning is over! You must keep up with all the new drugs and procedures that are constantly coming out. I'd also suggest, even if you become a NICU nurse, that you join the ANA and get their journal "American Journal of Nursing" as well as the "Nursing2002" (or whatever year, lol) journals to keep up to date with regular med-surg type nursing. Don't let yourself get behind because it's awfully difficult to catch up! Who knows, you may decide after a few years that you'd like to work in another area rather than with NICU babies... Just good old-fashioned advice...
Academy of Neonatal Nursing
National Association of Neonatal Nurses
Association of Women's Health, Obstetric and Neonatal Nurses
Best wishes for a fantastic future!
Anaclaire