You're in a hotel room, and you want to hook up to the in-room Wi-Fi. And guess what? It sucks, just like at every other hotel you ever stayed at. So Instead you dig out your MacBook and hook it up to the hotel's Ethernet cable, and use internet sharing to generate your own wireless network.
Wait… The newest MacBooks Air don't have Ethernet ports. But don't worry: you can pick up the $60 mySpot from Kanex, a little dongle which takes an Ethernet connector and turns its sweet network payload into a wireless cloud, ready for all your iDevices and your non-Ethernet MacBook Air.
Yes, you could use an AirPort express to do the same thing, but it's bigger and more expensive, and if you use it for AirPlay duties at home you're going to have to reconfigure it every time you want to make a hotel network.
The mySpot is powered by USB, so of you're using a computer you can just jack it into the side. Otherwise, your iPhone charger will do just fine.
I'm actually tempted by this. Or I would be if my iPad's 3G connection wasn't faster than most hotel connections anyway. Available now.
Source: Kanex mySpot.