USB belongs to the world of computing
,
and this sector had feel first the need ,
so to create an compatible standard about connectivity.
There is no need to say how happy I am, that by the same USB cable ,
I can connect on my computer my HP iPAQ rx5915 (PDA - GPS) and my portable hard drive (mini USB).
The next group that needs to find common ground about USB connectivity ( that includes data transfer and charging)
are the manufacturers of the digital photo & video cameras.