I'm using http://stereopsis.com/flux/ right now as well as a lamp behind my monitor and I still think it's too bright. I think the problem is most websites. Everyone has different preferences so I'm not saying it should be one way or the other, but we *should* have the option to select a dark theme on a web site and vice versa. I wish Google+ had this feature, because it's way too flippin' bright for me.