besides the usual yoguies, mealworms, pine nuts, almons slivers, etc.

what are some unique things you guys give for just treats?

Dried fruit (Cranberries, Papaya, Mango)... since all their food served for meals is fresh, the dried foods are a 'treat' to them. They will cuddle on their backs in my hand and take the fruit from me and make that adorable happy chirping noise while they eat it.
They also do that when I give them scrambled eggs this way.
To them, anything you give them by hand outside of their cage seems to be interpreted as a 'treat'. So there is no need to feed them fattening or super sugary items to spoil them.

I personally give White Hersheys Morsels (NO COCOA!)

Some people give the fruity flavored mini-marshmallows.
Honey Nut Cheerios.
Kashi Go Lean Cereal.

<font color="green">dried grasshoppers, live or dried crikets.</font id="green">

http://www.sugar-gliders.com/nutrition-health.htm