We made the Caprese Burgers recipe from Food and Wine Magazine (Aug 2012, p.64). It was fine but not amazing. It just didn't wow our taste buds, but it helped us use up some of the basil we've been growing.
Basically, the recipe calls for making a pesto using basil, salted roasted almonds, garlic, olive oil, pecorino-Romano cheese and salt & pepper. The pesto is mixed into the meat and is also used on top of the burger which has fresh mozzarella and tomatoes.
Again, it was fine.
But still, no burger compares to the Triple Smoke Burger recipe, the best burger recipe we've come across.