August 26, 2008 (HP13).  Reports on Progress in Physics (IOP) launched a Key Issues Collection which brings together a series of reviews focusing on the burning issues in physics. Among the review papers included in the Collection, which is free to access until December 31st, 2008, we noted two papers of direct interest to researchers into superconductivity:

• Two gaps make a high-temperature superconductor?
  S Hüfner, M A Hossain, A Damascelli and G A Sawatzky
  Rep. Prog. Phys. 71 No 6 (June 2008) 062501 (9pp)
• From high temperature superconductivity to quantum spin liquid: progress in strong correlation physics
  Patrick A Lee
  Rep. Prog. Phys. 71 No 1 (January 2008) 012501 (19pp).

The whole Collection is accessible at:http://herald.iop.org/KeyIssuesCollection/m18/kje/132364/link/1878