airport express has a usb port on it - does anybody know when we might expect to be able to control the powerlinc wirelessly through the airport express?
This is pretty much up to Apple. To my knowledge, the USB port on the Airport bases can only be used to connect USB printers. Unfortunately, they don't provide any type of mechanism (or APIs) to make arbitrary USB devices usable via the Airport.
Instead of waiting for Apple, why can't there be an ethernet based X10 controller. It seems obvious to me. It took so long to get to USB, manufacturers should have gone "all the way" to ethernet. Maybe it exists and I don't know of it???