Personally I have used leather_wings for about 
four years. Before that I had about four/five 
names. I used the different names for different 
hobbies - it actually was easier for me to keep 
track of what i was doing.  Kind of like putting 
on different hats. 

As for the origins of this name, "On Leather 
Wings" was the first episode of Batman: The 
Animated Series, still my favorite series to date.