[myhollowworld2]

I don't really understand what you would accomplish with the screen OFF though. Just kidding. But I don't really see what uses you would have other than for music, and maybe long highway stretches when you're using the GPS. Otherwise, I know my data connection stays open when the backlight goes out. I keep online using Slick with my phone in standby/when suspended.
I guess I just don't see the point. Even if you're listening to music with the backlight all the way, it shouldn't drain that much power. But I guess every little bit counts.