I got this to provide WiFi downstairs. It plugs into the router attached to the wired ethernet and provides a WiFi point for mobile devices like iPod Touch or iPad.
The pocket travel bit wasn’t relevant to my needs – it was just the cheapest suitable device I could find at £8.95. It does need a spare USB power supply though as it doesn’t come with one. It does have a USB cable and an ethernet cable.
I telneted into it and saw Busybox. It didn’t seem to be configurable that way though, I had to get the web interface working on 192.168.16.254 which meant temporarily setting up one Mac on 192.168.16.xxx so I could connect it to the ethernet port and do the settings. It needed a reboot between every setting to get them to stick but it is a once-off. Now it has an SSID and a password of my choosing.