Edit 1: technical difficulties in tagging and a premature post. It is not like any of you guys have never been premature.
You have likely seen this video going around the interwebhubdeadcat thingy.. it is none other than a set of custom levels for the old Super Mario Brothers game.
Myself, I think this is why we need a 2d sidescroller game on Wii with a similar ability to download custom levels such as this one.
[strike out:]GAH! Cannot tag into this post Super Mario Brothers (NES), Super Mario Brothers (GBC), Super Mario Brothers (Wii), New Super Mario Brothers (NDS) or New Super Mario Brothers (Wii). GAH! Though, I recall having this issue before with Chromium... Eris Damnit >.>'[/strike] (would be nice if we could strike out text to show it was deleted... >.>')