Please bring back the discussions in each skill.
They give great tips to help people progress down the tree.
Check out LauraGjovaag point 7 on this link http://www.duolingo.com/comment/1546916
Basically, they did away with them because no one was using them. The good news is you can still access them, it just takes some time and a work around. LauraGjovaag has taken the time to link all the discussion in the Spanish forum here:http://www.duolingo.com/comment/1586053.
The french discussion forums begin at http://www.duolingo.com/topic/147 (general discussion) and http://www.duolingo.com/topic/148 starts Verbs: Infinitive 2 Discussion.
It appears that they've taken those comments down :(
Those comments were always helpful on tough topics. People probably didn't add to them much because they just sort of contained reference material and tips.