I find it much easier to hold the DS 'sideways' for games like Puzzle Planet League, Brain Age, and Hotel Dusk than to hold it the usual way. Plus, it often feels like that lets them make better use of the two screens. So... what other 'sideways-supporting' games are there? I know the new Ninja Gaiden is going to be like that, and there are parts of The Rub Rabbits that are sideways, too. But I can't think of anything else.