For birds... Turkey, dove, and pheasant are all great. Dove breasts wrapped in bacon and grilled--the candy of the wild game world.
For fish... Crappie is the best I've had. Walleye are also pretty good. Don't really keep fish all that often though.
For furry critters... Deer is the best I've had, although I would like to try such things as elk, moose, antelope, etc.