And my answer is, not much.
When I’m in my office, prepping for a case, I’m a heavy computer user - cases, statutes and journal articles are all available on-line, I prepare briefs and memos on my computer, I have a lot of e-mail correspondence and exchanges of documents, links, etc. I have two desks, and I find I sit at my computer desk more than my writing desk (I do also write documents - with the aforesaid fountain pen). I’d be lost without computer access in my office.
But when I’m in the courtroom, it’s an entirely different type of work. I’m either listening or talking. I’m listening to the judge, to opposing counsel, and (rarely, in my case) to witnesses. I take quick notes, but they’re not a transcript - they’re to remind myself of points I need to respond to. I have my own notes ready for my orals.
And when I’m talking, I need to already know what cases and statutes I’m going to refer to, and I’ll have the citations and tabs in the Book of Authorities incorporated into my notes for orals. One of the easiest ways to distract a judge and to lose the train of your argument is to stop and try to find the reference to a case or statute that you’re discussing - whether hunting through the physical Book of Authorities, or doing an electronic search.
It sometimes happens that the judge or opposing counsel may refer to a case or statute that I haven’t put into my orals, but if I’ve done my prep work right, I should have anticipated that, from reading opposing counsel’s brief - and I’ll know where to find it in opposing counsel’s Book of Authorities.
Frankly, if I needed to be poking around on my computer in the courtroom, while either the judge or the other lawyer is talking, it would mean I had not properly prepared, and was losing valuable chances to understand opposing counsel’s argument and to adapt my own argument to the points that the judge seemed interested in.
So there aren’t many gadgets that I would find useful in the courtroom itself - it’s a different type of work from the prep work I do in my office, where the computer is invaluable.
I’ve heard it said that 90% of court work is done in your office.