The most epic marinade I have had: 3/2/1 balsamic vinegar/brown sugar/worcestershire sauce, complements of Katie of the "A Hungry Bear" blog. Cooking consisted of 2 minutes on each side over hot grill followed by 15 minutes in a 170° oven. It came out a buttery soft rare to medium rare and was possibly the best beef I have ever prepared. Accompanied by grilled peppers and onions.
YUM!
Question: Have you tried the marinade with other meats? I'm thinking this would be fantastic with pork loin or chops.