For white coat pocket info sources, I just Sanford (free from rep, or maybe $3-15 depending on if you need new or 1-2yr old one), Maxwell ($5), and Tarascon Pharmacoepia (again, free or maybe $3-15). I may carry pocket ER, gsurg, etc books for specific rotations. Usual stuff like scissors, tape, pens, pad, and round sheets too.
The cheapo pocket books never run of of batteries, never crash or lose WiFi signal, don't weigh you down, and at those low costs, who even cares if they get lost or stolen? Can't say the same for PDA/iphones/etc which are $250+ not including screen protectors, software, chargers, case, monthly fees, etc etc etc. I can generally find drug doses, etc in my book before students rounding with me can unlock or power up their blackbery or iphones.
Why spend $ if you don't need to, esp as a student/resident on limited budget and probably working in some inner city teaching hospitals where expensive stuff tends to disappear from break rooms, computer desks, libraries, surgery lockers, etc... JMO.