The Save and Quit blog reports that a group of hackers figured out the algorithm
behind a set of promotional codes that were each redeemable for 160 MS points, the currency used on Xbox Live. Quoting:
"A person would just have to sit back and refresh over and over and rack up the 160MSP codes. Not every code would work, but a majority would. The site started to 404 due to the heavy traffic. If you have closer ties to the pirating community, you could find a program to get the codes for you. ... This method took a little more work out of the user, but it was still simple enough for a 12 year old to figure out. ... Microsoft found out about this exploit and put a stop to it immediately, but internet pirates still had enough time to steal $1.2 million worth of Microsoft Points."