I've never liked the idea of putting the incredibly sticky adhesive that's provided to attach the EZ-Pass velcro to the windshield. Also, since I'm going to be tinting my windshield, I wouldn't want a little white box glaring through. So I picked up one of those EZ-Pass holders for $6 and painted the EZ-Pass backing with a flat-black. Looks nice I think.
I haven't seen many ideas for mounting this thing, so I thought I'd post mine. Hope it helps someone.