Here is the list of references that my group, (Willie, Isaac, Stefan, 
and I) have been using in studying the subject of Conformal Field Theory. 
If you are interested in joining our group, please let me know.


Di Francesco P. et al. "Conformal Field Theory" Springer, (1997)

Henkel M. "Conformal Invariance and Critical Phenomena" Springer (1997)

Ketov S. "Conformal Field Theory" World Scientific (1995)

Ketov S. "Quantum Non-Linear Sigma Models" Springer (2000)

Schottenloher M. "A Mathematical Introduction to Conformal Field Theory"

Efthimiou C., Spector D. "A Collection of Exercises in Two Dimensional 
Physics, Part I" arxiv: hep-th/0003190

Ginsparg P. "Applied Conformal Field Theory" arxiv: hep-th/9108028

Graeme Segal Notes on Conformal Field Theory
-> can be found inside:
Tillman U. "Topology, Geometry and Quantum Field Theory - Proceedings of 
the 2002 Oxford Symposium in Honor of the 60th Birthday of Graeme Segal" 
Cambridge University Press (2004)