If you want to see yoshi flash movies, just go to http://www.newgrounds.com/portal/ and look around. Just to warn you, some flash movies are rated all ages while other videos could be rated 18+. Don't worry about this though. The ratings are shown on the page where you watch the video. (You see it before you press the button to play)
Here's a really good flash video that doesn't star yoshi, but he appears in it later on. I thought the spoofs were funny. Here's the link for it....
Just to tell you, 'Flashplayer' is a good site to find yoshi movies too.
Bye for now! (^_^)