I am definately minded towards dark because of contrast and ease on eyes as too improved legibility in the white on black/dark taupe background.
I used to keep white on blue in MS word, now i immediately set display to a darkish sky blue/azure background so all windows get black on sky blue and
i find that much better for the eyes over time, i am given to understand it helps somewhat if Dyslexic as well, apparently.
But the light text on dark contrast is a favourite in numerous application and web UI skinning.
There is coding for allowing a range of user chosen skins for web UI as well.
Maybe as the site user interface is evolving as much as look, as you say, factoring a choice to user in member tools of the light or dark background,
maybe even a couple of others, retro and futuristic above default or something, may be very popular with the ATS demographic.
Peace.
[edit on 12-2-2010 by DeltaPan]