That trick is awesome. Here's another one:
Run towards a power switch. Jump on it, turn around and make yoshi shoot out his tongue. If you're fast enough, the switch will be activated, while yoshi has another in his mouth!
I know more, but that's all for now. Mario Bros. 3, Mario World, Yoshi's Island and Mario RPG are some of my favorite games. I don't like the advance versions, however.