[hannahmitt]

The other end of the USB cable and tinkering through that is usually enough. But definitely nice to have non-permanent adhesive.

[mikeyouse]

I used these recently to hang a ~20lb whiteboard -- They're incredibly sturdy:

http://www.command.com/wps/portal/3M/en_US/NACommand/Command...

[kevan]

You can find adhesive velcro at craft stores, it would probably be a pretty good option if you need to remove it occasionally.