Wow, this is an interesting story.
Steve Friess has a note on his blog that says that MGM Mirage's company wide sports book network went down this afternoon, making it impossible to place bets at any MGM Mirage property - this includes Bellagio, MGM Grand, The Mirage, Mandalay Bay, Treasure Island, Monte Carlo, Luxor, Excalibur and Circus Circus.
This comes on the same day as a major boxing event and the Kentucky Derby - two MAJOR betting events.
Now, being in the technology field, I know that these things happen. I also know that these systems all have backup systems and that they train for these outages. I'd love to get some details on how this went down and what happened.