Can't I use different Wi-Fi networks for different Locations?
Solution 1:
The Sidekick app (which used to be called NetworkLocation) is an ideal tool for automating changes based on the location of your Mac. It's a veritable swiss army knife of tools, works well in Lion and has plug ins and terminal support for extending it should the built in tools not cover your additional use cases. For simple network location changes, you are covered with this app.