As mentioned in the rant thread, I have an old Wifi to Ethernet converter. This gives me four Ethernet ports where they'll do most good and connects to my router via Wifi.
I finally worked out why I couldn't get it to see my new wireless network - it speaks WPA and the new router defaults to WPA2. Tweaking the router settings so it was also using WPA and all was well.
Question: How less secure is WPA than WPA2? I'm using AES rather than TKIP.