The only time I've used a PDA is during rounds when I wasn't near a computer to access Clinical Pharmacology. And that was just the calculator. I've found that I actually know most of the crap they ask me, which honestly surprises me. They'll still stump you on the oddball questions ("Hmmm...does DPP-IV metabolize polypeptide Y, I forget...where's pharmacy?") and a PDA ain't gonna help you with that crap. But, hey, it make for a nice, warm security blanket.