I find myself changing render effects a lot on my Nexus One. During the day brightness is ok, but to read on bed it's extremely bright even on the lowest setting.
I find that going to
interface (why not under display?),
render effects, and selecting either
night mode or
blue works wonders. Even if still too bright, it's worlds better than before.
But going to that menu all the time is a pain. Is there a widget or a patch to add to the notifications power bar or something?