The quick summary is that statutory damages are between $750 and $30,000, at the court's discretion, except in the case of willful infringement, wherein they go up to $150,000 per work. Conversely, in cases where the infringer "was not aware and had no reason to believe that his or her acts constituted an infringement of copyright", damages may be reduced to "no less than $200."

See 17 USC 504 (c) for more information: http://copyright.gov/title17/92chap5.html#504