SaruCoder has posted a video of his homebrew game Plasticshell. The gist of the project was to see how platformers (such as MetalSlug) would do if they were played sideways on the DS.

Feedback can be left here: http://forum.gbadev.org/viewtopic.php?t=14818

http://www.youtube.com/watch?v=gXAtOYcAcbs