I use my PDA for a handy drug book that has a built in drug calculator and a set of tools for calculating glucose infusion rates etc. that makes pt. care easier. And the voice recorder could be useful...
I have a Palm Tungsten T2 that has a digital voice recorder but I think it only does 30 sec. max. But there a number of useful downloads for nurses. I work Neonatal ICU so I carry the neonatal drug...