Since I have lived in Canada I've witnessed all sorts of strange and wacky ways to remove the flesh from a mango. Usually they seem to involve removing the skin first. Sorry guys, but that is not the best way. All that will happen is that you'll have a lot of mushy mango bits.
Basically, you'll cut the "cheeks" off the mango (the sides on the flat part of the seed), score them and then turn it inside out. Here's a vid from youtube to explain it really clearly. Enjoy!