Americans stopped using NDB approach plates in 2005 (
AOPA Online: So long to 216 NDB approach procedures). As far as I know, GA still uses them but unofficially - although no valid approach plates exit, some of those NDBs are still up and running.
For exam, if your examiner decides to test you on that (although I doubt it) he will most like take you to EPBY - closest airport with valid NDB procedures.
Anyway, I've been told that (in Poland) all NDB procedures are going to be decommissioned sometime late 2013 or 2014.