I find anything that comes as a "make your own" is popular with guests, both at our wedding and the ones I've read here! We had a build your own carb bar with potatoes, risotto and mac & cheese with various toppings as well as make your own omelet (we had a brunch wedding). Also the Pasta with Wild Mushrooms, Roasted Tomatoes Confit, Spinach, and Asiago Cream Sauce was the most delicious pasta I've ever had in my life (yes, I went to look at it from my menu, because it was THAT GOOD).
We also had the Parmesan Crusted Chicken with Marsala which was well raved on and incredibly yummy.