I've seen our mechanics come out to the airplane with iPads nowadays.
Before they'd arrive with paper copies of the maintenance procedures, now they are arriving with an iPad with electronic copies of the fault isolation manual, then referencing the appropriate maintenance procedure thru their iPad.
I have no idea what app they are using though. It could be goodreader for all I know.
On the flight ops side all of our manuals are PDFs that we read through Goodreader. As great as that sounds, the flight manuals are quite useless in PDF/electronic form they way they implemented them. And the Jeppesen app is not much better, if you aren't using the latest iPad it's quite buggy, slow, unresponsive and prone to crashing.
More useful are the two internally developed company apps which allow us access to all the things we'd normally access on the computer in ops and at the gate on our iPads and personal iPhones. Ever since we got these two apps, I haven't needed to touch a company computer at work.
The first allows us to access our dispatch flight release paperwork on the iPad, but we still need to carry and sign the paper version to handout to the gate agent. From the app we can pull anything we want: passengers lists, non-rev passengers, connecting gate info, performance numbers for the runway, our schedule, the airplane's routing, maintenance deferrals, the flight release, NWS and WSI weather and NOTAMS, company/station ops and deice frequencies, etc.
The second app, allows us to have realtime access to our Flight operations system/SABRE FOS and the passenger reservation/SABRE RES and watch the gate agent check each passenger on the flight as they're doing it and watch the passenger numbers go up, and pull up each passenger's PNR details.
Bonus animus sit, ab experientia. Quod salvatum fuerit de malis usu venit judicium.