Can't find any examples of platformer games...links?

I want to make a side scrolling platformer game like Contra/Super Mario/Megaman. I have found examples of gravity, jumping and keyboard control, but I haven’t found any examples of how to get your stage to scroll as the character moves around. I’ve already seen the tile based tutorials and those really don’t do what I need. I am looking at making the game size 640x480 @ 30fps. Is there any way to be able to setup the entire stage and just have the player be able to see the 640x480? Ive tried out Gamemaker and it will do that, but it has no antialiasing like I can get with Flash (I’m using 3D rendered sprites in .png format). Any help is much appreciated.