Funny really, because I find that light skins are harder on my eyes than dark skins. The brighter glare of light skins tends to hurt my eyes over time, were dark skins don't have that effect on me.
I actually perfer darker skins which uses grey and black tones. I just like the styles of dark skins over light skins. Maybe it's me, but it seems as though colors are better viewed over a dark skin.
i like my styles to be either all black with dark grey text or all white with bright yellow text. havent seen any complaints yet :P
seriously tho i prefer light over dark
definately light but not too light. The vB Default is too light, but the purple style here is just right. Also, no red or green. Blues or purples are best but have to be used in moderation, and no white but lots of off-white (say #FEFEFE)