Mario Kart

Super Mario Kart
Items:
 * Banana
 * Coin (absent from 64, Double Dash!! DS, and Wii; Also, only Super and 8 features the item in an Item Box)
 * Mushroom
 * Green Shell
 * Red Shell
 * Feather (absent from all following games)
 * Starman
 * Lightning
 * Boo - absent from Double Dash!!, Wii, 7, and 8

Mario Kart 64
Items:
 * Multi Banana (5 in 64, 3 in all other games)
 * Fake Item Box - absent from Super Circuit, 7 and 8
 * Triple Mushrooms
 * Golden Mushroom
 * Spiny Shell
 * Triple Green Shells
 * Triple Red Shells

Mario Kart Double Dash
Special Items:
 * Fireballs (Mario/Luigi)
 * Heart (Princess Peach/Princess Daisy)
 * Yoshi/Birdo Egg (Yoshi/Birdo)
 * Golden Mushroom (Toad/Toadette)
 * Chain Chomp (Baby Mario/Baby Luigi)
 * Triple Shell (Koopa Troopa/Paratroopa)
 * Giant Banana (Donkey Kong/Diddy Kong)
 * Bowser Shell (Bowser/Bowser Jr.)
 * Bob-omb (Wario/Waluigi)

Mario Kart DS
Items:
 * Blooper
 * Bob-omb
 * Bullet Bill

Mario Kart Wii
Items:
 * Mega Mushroom
 * POW Block
 * Thunder Cloud

Mario Kart 7
Items:
 * Fire Flower
 * Super Leaf (MK7-exclusive)
 * Lucky 7 (MK7-exclusive)

Mario Kart 8
Items:
 * Boomerang Flower
 * Super Horn
 * Piranha Plant
 * Crazy 8 (MK8-exclusive)