I use the Ipad for recording kids more than anything for 'self evaluation':

Stuttering

Articulation

Classroom social skills

I have junior/senior high students so they love being recorded and seeing themselves.  After I record them in class,  they get to watch it and  I have a 'checklist' of skills for the student to 'rate' their skill  from 1-10 and then they make a 'goal' that they need to do the next time.