Here’s a great concept I came across: Connectify lets you turn your computer into a WiFi router, letting you share your internet connection with friends and family. There are a number of things you can do with this, ranging from sharing your wired connection with other devices around, all the way to sharing the WiFi connection you’re using with other users who don’t have an account. Say, for example, if you’re in a hotel room with your computer connected to the room WiFi and you want your mobile phone to get an Internet connection, this would be an option.
It’s only available on Windows 7 because the software requires some features that aren’t available in previous versions of Windows. Sign up for the Beta and give it a whirl.