Another possible solution is to use a a travel router.

(discussed at http://www.flyertalk.com/forum/trave...el-router.html )

The Asus WL-330GE seems to be recently recommended.

It appears you can connect the router to a single wired OR wifi connection in a hotel, and then share that connection with as many laptops/iphones etc, as you want, by creating your own personal in-room wifi hotspot.

As its a router, the hotel only sees one device/MAC address connected to their network.