I am a Civil Tech for local munincipality.
Use "PDF Expert" on my iPad for storing and reviewing Plan Sets, Proposals, Standard Plans, Spec Book, a few Manuals. I can also down load important documents and forms from the D.O.T. website and completely fill them out as needed on my iPad.
I use "Logmein Ignition" to do daily reports, post payments, and contract modifications from the field instead of hauling my laptop out of the office every day.
I have much more room in my work truck now that I can leave my laptop, blue prints, various manuals and forms around with me - iPad holds it all now.
I can keep up with my work email, watch movies, read books, pay my own bills, play a few games, and surf the web from my iPad when I am stuck out on a road project with a little free time.
My bosses have no problem with my use of the iPad at work, no one else in my engineering department has a iPad but they are beginning to look into getting all the techs one.