I generally won't complain about color schemes, but could you please tone down the red or darken the green on the header bars? It actually kind of hurts my eyes.

One thing worth noting; the "subscribe topic, previous topic" etc text is the same color as their respective header bar and you have to highlight it to see them. I'd suggest using a dark purple since it's your active link color that is probably causing this and that way links will still show up on the white backgrounds as well. The hover link color is fine, though red tends to blend into pink real well.