Help re reducing texture memory usage in horizontal scrolling game? (image sizes, off-screen culling etc)

If you do scrolling based games I would appreciate your feedback on my “how to reduce texture memory” and what tool you use to develop graphics when the level size might be say 3 - 6 screens wide.  I have posted it in the graphics/api section however (perhaps not the best place)…If you click on the link below you’ll go straight to it…thanks…

http://forums.coronalabs.com/topic/37209-help-re-reducing-texture-memory-usage-in-horizontal-scrolling-game-image-sizes-off-screen-culling-etc/