Wii Sports resorts is 12 games and the motion plus accessory bundled together. The motion plus accessory amkes the controller behave almost perfectly accurate, so your motion are in a 1:1 ratio. It includes things like sword fighting, wakeboarding, table tennis, and many others. It's 49.99 currently with a 59.99 bundle coming soon that gives you two motion plus accessories.

Wii Play comes bundled with wii remotes for an extra $10. It is another set of minigames that show some of the possibilities of the wii, but doesn't go in depth with any of the games. I believe it has ten games including tank fighting and some cow racing. I believe this is on special for $40.00 at amazon right now.

Wii fit is the excercise game which includes the wii balance board. Exercises range from balance, yoga, strength and cardio excercises. The blance board is a device that lays on the floor an can read your weight and reacts to how you distribute it into 4 quadrants. normally 89.99, but I blieve it is listed on here as being 69.99 at kmart right now. Also there is a new wii fit plus with more exercises that is 19.99 alone or I think 99.99 with the board.

Hope all this helps. Your best resource for this stuff is probably amazon and wikipedia.