A list with radio station frequencies to listen on the one remaining ADF and not much else. All Company manuals and additional information is on the EFBs and always up to date, and to be honest i do keep a copy on my iPad as well, easier to read on there.
The company doesn't actively discourage one from keeping his own information binder, some keep a paper copy of the delay, fuel supplier codes etc, however even that changes from time to time and the only official information is the EFB.