Interesting link on one of Sungard’s sites with good descriptions of recent and not so recent financial disasters – may be of some use in terms of learning from the past (given what has been going on lately!):

http://www.erisk.com/Learning/CaseStudies.asp

and in more visual form the "wheel of misfortune" at:

http://www.erisk.com/Learning/CaseStudies/WheelofMisfortune.asp