Dates stuffed with a blend of cream cheese, and blue cheese are great.
I have catered a wedding for 100 ppl using a Bruschetta bar. Huge basket filled with crostini, and a couple of different toppings. Standard Bruschetta topping of tomatoes with garlic, basil, olive oil, and a splash of red wine vinegar is a must have. You can also put out a bowl of Tapenade, and some roasted red peppers. Let people make their own, so they won't get soggy.