Do you know where one could read on <a href="http://www.maths.ox.ac.uk/node/11427" title="link">"Modular Forms, K-theory and Knots"</a>? The combination of themes sounds thrilling! 

Edit: Zagier's paper on "quantum modular forms" will be published in <a href="http://noncommutativegeometry.blogspot.com/2010/12/quanta-of-maths.html" title="link">Clay's volume</a> 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 <a href="http://mathcs.emory.edu/~ono/publications-cv/pdfs/114.pdf" title="link">survey</a> + <a href="http://swc.math.arizona.edu/aws/2013/2013OnoNotes.pdf" title="link">lecture notes</a> by Ken Ono on harmonic Maass forms.