Bluetooth won't work, sadly ... rumor has it that SharkModem will allow tethering via BlueTooth, but the standard Blackberry-as-a-modem feature is USB-only. SharkModem has other limitations, too (5 connections ... more software to install ... you have to go through a localhost proxy, so you have to custom-config every internet app), so I'm sticking with USB.
Bluetooth would be nice, though. Just talk to the BB on my hip.
As for velcro--I figured I'd use that 3M adhesive that comes off nice and clean. It is a good point about the strain, though ... I'd hate to be tugging on the screen all the time.
Maybe one of those tight-fit neoprene cases that you can leave on while you use the laptop ... then I could just slide the BB into a pocket.