ALL my Traveller games have used a computer during play since '82!
Some were laptop-ish (just not battery powered), many used a TV as a monitor or tiny LCD style mono-colored displays - I even custom build LED die rollers (for secret rolls).
As a referee I found all sorts of uses - starting with chargen (instant NPCs), encounters (animal, etc.), random trade generation. Tracking for personal and ship combat. As well as for props - news, bulletins, contracts, sounds and even instant random maps.
I've even used multiple computers - so players not only had reference material and tracking tools, but we could also RP typed communications.
Currently prepping to use iDevices. While I do wish they supported pen style input (and freaking foil backed light reflective displays with anti-glare/anti-smudge coatings like I've used in industry for 20+ years - geez!), they are otherwise quite close to my optimal RPG aid! (Wireless to my projector would be another nice plus - but this is doable with a cable.)
Looking forward to the day that multi-touch tabletop computers have enough resolution to support my 'needs'! True tabletop roleplaying.