If Heise News can be trusted (which usually is the case), then nVidia is now giving out free licenses to NVidia Parallel NSight Professional, and Standard is no longer available.
Thank you nVidia!
EDIT: just found the announcement (dated January 20th) of NSight 1.51 in the corresponding sub-forum. Yep, it’s true. Version 1.51 has all the Professional features.
EDIT2: it just came to my mind that anybody who bought the Professional version before might have the F-word in mind, instead of “Thanks”. I hope nVidia has done something to compensate and ease previous buyers.