parisattack: <wordfunph: 1...Nc6!?>Miles had a fondness for it, often played 1. ...Nc6 and 2. ... d6.
It is a nice 'Repertoire' move, and popular at least at the club-level if the number of books is to be taken as a guide:
Nimzovitch ---
Deppe - Die Fischer-Nimzowitsch Verteidigung
Harding - The Nimzowitsch Defence
Kapitaniak - Nimzovich's Defence
Myers - Exploring the Chess Openings
Myer's - Nimzovich's Defence to 1. e4
Schwarz - Aljechin und Nimzowitsch Verteidigung
Chigorin ---
Bronznik - Die Tschigorin Verteidigung
Chess Digest - Tchigorin Defense
Dunnington - The Chigorin Queen's Gambit
Morozevich / Barsky - The Chigorin According to Morozevich
Schiller - How to Play the Chigorin Defense in the QGD
Soltis - The Tchigorin Defense (1994)
Soltis - Queen's Gambit Declined - Tchigorin Defense (1972)
Watson - Queen's Gambit - Chigorin Defence
Tango ---
Orlov - The Black Knight's Tango
Palliser - Tango: A Dynamic Answer to 1. d4
Repertoire ---
Berdichevsky - Modern Practice 1. ...Nc6
Keene / Jacobs - A Complete Defense for Black
Keilhack / Schlenker - 1. ...Nc6 (German)
Schyuler - The Dark Knight System
Wisnewski / Scheerer - Play 1. ...Nc6.