Persuasion is also pretty useless, its very hard to persuade good lords to join your cause. It only works on companions a few times.
Tracking has very limited use, the only times I have found it useful are "follow the spy" mission and track down group that has attacked travellers mission,this mission has become very hard to complete as its often offered when vast distances are involved ie windholm guildmaster sent me to track down jatu army
Tracking has helped me with the above missions
I'd also add athletics, the very slight speed increases are hardly noticable.