I also find all this "leadership experience" advice to be highly suspect. Unless you can differentiate yourself from every other tom male private part and harry who was treasurer of their pre-law society, you are going to be relying on numbers alone. i understand admissions boards weigh volunteer service in programs that benefit community much higher then activities like pre-law societies that serve to benefit the members.
For example, a 22 year old mom, who has earned her BA degree while working and raising a baby is NT. or a 25 year old who has been working for 2 years with a child to care for and a mortgage to pay.
Also, you are incorrect in your descriptions of who can be considered non-traditional. Nathanielmark, your idea of non-trad. is too general.
"Special circumstances"/Non-Traditional, what's the difference? Couldn't traditional be defined as the absence of special circumstances?