Guys, the velcro is attached to the back of my battery door. I use a 7280.
I use the male side of velcro, it does not stick to my clothes when in my pocket.
If you are worried abotu re-sale value, you can always replace the second battery door if the glue doesn't come off all that well..
and it is neat and tidy. I even use a strip of velcro on my wall at the office to cradle my blackberry at eye level =)
If you are sticking velcro to a blackberry without a battery door on the back, then you have a different decision, but you corporate whores with a corporate supplied device, why do you care?