TITLE: What's about "quantum modular forms"? 
QUESTION [19 upvotes]: Do you know where one could read on "Modular Forms, K-theory and Knots"? The combination of themes sounds thrilling! 
Edit: Zagier's paper on "quantum modular forms" will be published in Clay's volume dedicated to Connes anniversary.  
Edit: Copies of the fascinating article circulate in the web. If asked by email, I would help finding it. 
Edit: a survey + lecture notes by Ken Ono on harmonic Maass forms.

REPLY [6 votes]: There is an article Conformal Field Theory and Torsion Elements of the Bloch Group by W. Nahm in the book Frontiers in Number Theory, Physics, and Geometry II. This is a reference for one direction in the abstract of the talk by Zagier.