Plug and Browse
Every time you connect to a different network, you need to manually change all those settings, which can take a considerable amount of time. That's where Plug and Browse helps. This exceedingly simple tool lets you instantly switch to new, predefined network settings with the double-click of a mouse. You set up a profile for each different network, then double-click that profile when you connect to the network.
Making things even easier is that you don't need to create the profiles manually. Connect to the network, tell the program to gather the settings, and it does it all for you automatically, creating a new profile. The program works with any kind of network, not just wireless ones, so it's useful even if you don't connect wirelessly.