Topics in Cusped/Lightcone Wilson Loops
  I review several old/new approaches to the string/gauge correspondence for the cusped/lightcone Wilson loops. The main attention is payed to SYM perturbation theory calculations at two loops and beyond and to the cusped loop equation.   These three introductory lectures were given at the 48 Cracow School of Theoretical Physics: "Aspects of Duality", June 13-22, 2008, Zakopane, Poland. 
Yuri Makeenko (ITEP, Moscow)