Necklace Lie algebras and noncommutative symplectic geometry
  Recently V. Ginzburg proved that Calogero phase space is a coadjoint orbit for some infinite dimensional Lie algebra coming from noncommutative symplectic geometry. In this note we generalize this argument to specific quotient varieties of representations of (deformed) preprojective algebras. This result was also obtained independently by V. Ginzburg. 
Raf Bocklandt and Lieven Le Bruyn