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Observational and theoretical evidence that internal, slow ("secular")evolution reshapes galaxy disks is reviewed in Kormendy & Kennicutt (2004,ARAA, 42, 603). This update has three aims. First, I emphasize that thisevolution is very general -- it is as fundamental to the evolution of galaxydisks as (e.g.) core collapse is to globular clusters, as the production of hotJupiters is to the evolution of protoplanetary disks, and as evolution to redgiants containing proto-white-dwarfs is to stellar evolution. One consequencefor disk galaxies is the buildup of dense central components that get mistakenfor classical (i.e., merger-built) bulges but that were grown out of disk starsand gas. We call these pseudobulges. Second, I review new results onpseudobulge star formation and structure and on the distinction between boxyand disky pseudobulges. Finally, I highlight how these results make a galaxyformation problem more acute. How can hierarchical clustering produce so manypure disk galaxies with no evidence for merger-built bulges?

Internal Secular Evolution in Disk Galaxies: The Growth of Pseudobulges