http://www.math.uiuc.edu/K-theory/0824, with applications to the Chern character from K-theory to negative cyclic homology
arXiv: Experimental full text search
NCG (Algebra and noncommutative geometry) (Algebra and noncommutative geometry), AG (Algebraic geometry)?
http://mathoverflow.net/questions/15795/the-infinitesimal-topos-in-positive-characteristic
nLab page on Infinitesimal cohomology