Last night I made London Broil with Soy Citrus Mayonnaise from epicurious.com It was fairly simple (though you need to marinate the meat for several hours) and the meat was quite tasty. It was a bit tough (it's London Broil, after all), but I was quite happy with the results. That said it wasn't special enough to make again.

Perhaps of greater interest than the recipe was the cooking method:

1 - Marinate the London broil (2-3 lbs/1Kg steak)
2 - Let it sit at room temperature for 30'
3 - Heat a skillet to high and sear on one side for 5'
4 - Turn the steak over, cover, lower the heat to medium low and cook for 10 - 15' or until it reaches an internal temperature of 120F/49C for medium-rare
5 - Put the steak on a plate, cover with a kitchen towel and rest for 15'