IPads. Most creatives have them now. Let's be honest we're all such Apple addicts it's more of a shock to people when we don't have one.
They're a great way to show your work. Personally I'm still an advocate of the Print Portfolio as your main stage but to have one to bring along to show extended project work, or to take to a PPM to show casting choices; darn handy.
But make sure you don't just rely on that lovely retina display.
One of my favourite folio apps is Folio Book. Which are your faves?