I have 1 of these for a digital camera and have just taken a look and it won't fit into the battery compartment of the GP2X as they have a slightly odd configuration and will only fit in cameras designed to take them.
I have had an email back from Jacquelyn she was surprised that I hadn't received consignment details from UPS. Apparently mine shipped on the 18th :) and is currently en route to the Maltese Islands as I type this and should be here in the next couple of days :)
Drop Jacquelyn an email and...