well puppy did it and it had a bzillion users, go figure
say..wigums, I tried a bunch of dark themes and most had the same text issue as dusk but as posted in the other thread the london smoke is not bad but if you want BLACK with white then try xfce-black, it seems to work for me with firefox so likely the other sites. think it is the white text with dusk as it does the search but you can not see the text because it is white.http://xfce-look.org/content/show.php/Xfce-black?content=149015
but as I mentioned in the other post with pics you can search for others at will, was looking myself so thought it may assist.
If you do try the london smoke remember to unzip the london smokes in gtk folder and place in main folder..