A recent frustration involved a DSL/wireless installation for a non-profit. I was running out of battery on my laptop trying to configure the wireless router settings for their new Motorola 3000/ Netopia 3347 ASDL modem and wireless router.
Every document I read said that the default username and password were "admin" and the serial ID of the device.
Actually, the default password is the Security ID of the device, printed on a separate yellow sticker on the bottom of the device.