XFCE, imo the only desktop non-crazy, non-underdeveloped as of 2015, just got a new release that according to the release notes, it keeps the good things getting better: XFCE 4.12!.
Which is great, because after 3 years from the previous release, I thought XFCE was dead and buried.
Meanwhile, pre-1.0 LXQt releases still look promising. When I tried 0.8 it gave me a black screen, but I really believe that it is working for someone out there. Will try 0.9 soon.