I don't know how many power ups there are in Mario but I do know there are a lot and I'm going to share some of the ones I know that you may not know.
The ice flower dose almost the exact same thing as the fire flower (which you probably know) except that instead of shooting fire, Mario throws ice.
This power up dose the same thing as the ice flower but it can also let you slide on the ice in the ice stages.
This power up lets you fly up into the air if you spin the Wii remote but you won't stay up forever because what goes up must come down.
This power up lets you glide from platform to platform any way! Down, up, to the right and to the left.