I do, because (sorry, guys) I find the original color theme simply unbearable. My settings are:
white white white lightgray #eee #eed black red green #909 #ccc
I find it marks well the difference between visited/unvisited links (green/red), quotes, and the green goes with the LWN logo. YMMV, and there are people that do not like the "white-background" theme, but it is what I found less straining.