The NRB seems to be a well kept secret!
That's very true. Other than people who read these forums, go to seminars, or have instructors who tell them about it, most people wouldn't know that the Narrow Route Brief is what they are looking for, even if they stumble across the AIS website. (And remember that, although there are doubtless a few instructors out there who don't show their students how to get NOTAMs, maybe even don't know themselves, there are also plenty of PPLs who have little involvement with flying schools and aren't in a position for instructors to show them.)
Perhaps the biggest single improvement which could be easily made would be to rename it, and make it more obvious (not just by the name, but also by the location of the link) that this is the "normal" briefing.
FFF
--------------