Cherimoya. A white fleshed fruit from South America, it tasted something like strawberry-banana yogurt with an almost pudding like texture. Not bad, although the big seeds were a pain to constantly spit out (maybe I was eating it wrong?). It's also called a custard apple.
Picture from Cook's Thesaurus
Kiwano Melon. The inside was bright green and was similar to jello. Tasted like a mix of lime, kiwi, and cucumbers. I won't be having this again, although Sarah loved it and just about ate the whole thing in one sitting.
Dragon Fruit. Very pretty fruit from South America (this particular kind with the purple flesh is from Costa Rica). It tasted like peppery kiwi, and all the little black seeds made it feel like kiwi as well.