Sprite sheet design considerations?

[megamarc]

AFAIK non power of two textures were introduced to prevent the waste of space and/or image rescaling associated with classic textures. But I'm not a chipset designer so I can't tell you first hand how they're implemented, but just what the system exposes. In any case, in tilengine there isn't any kind of memory or performance penalty for using arbitrary sized bitmaps, for sure!