I've been really into pomelos, which are also called Chinese grapefruits. They are the largest edible citrus; gigantic boulders that can feed three people generously. The outside flesh is spongy and smells very rich and rindy when you peel it. The taste is like a super light grapefruit, sweet and sour, a very dry citrus with huge segments. If you find them somewhere, buy the ones with an indentation on the stem (a "female") because the taste is usually better.
Also in season is hawthorn berry, a very popular Chinese berry used frequently in medicine and juices. During Spring Festival, people buy tremendous skewers of haw on large sticks covered in hard sugar, much like our candied apple. (They're called 冰糖葫芦 in Chinese) It's also eaten dried or used in special teas. The flesh is very soft and the texture is a little like cooked sweet potato. The taste is sour and complex, almost like tamarind and apples mixed together, although it's quite original and fairly incomparable to other fruits. You buy 'em by the bag. Absolutely delicious.
What's your favorite fruit? Post.