ok I suddenly had an idea for an app while in sciencs class - a ruler! with the right graphics we could have a 100%accurate pocket ruler on our ipod. the thing is ,theres 2 things I need help with 1) what is the ppi (pixels per inch) of the ipod vertically [basically I want to know how many pixels tall one inch is on the screen, in portrait mode] 2) if I add other rulers (thefirst one Im going to make will have inches on one side and cm on the other, but maybe I'll add different things like different precisions and colors, for easier visibility) then I'll need an app that can view AND switch pictures, but without the hassle of photos. for now, ill probably use the basic vista/light app. EDIT: turns out someone already did this, and did a pretty good job I might add. it works fine. http://images.google.com/imgres?img...uler&um=1&hl=en&rlz=1B3GGGL_enUS265US265&sa=N I edited out the text about the creator on mine, so if you want it just tell me.