MathOverflow will be down for maintenance for approximately 3 hours, starting Monday evening (06/24/2013) at approximately 9:00 PM Eastern time (UTC-4).
show/hide this revision's text 1 [made Community Wiki]

"The Geometry of Moduli Spaces of Sheaves" by Huybrechts and Lehn. Thankfully, it seems that an updated edition is in the works.