Sometimes we have to share USB internet connection with other devices like tablets or smartphone, especially when we are travelling. In these cases you can use MaryFi. MaryFi is a free tool for Windows 7 which lets you share your internet connection wirelessly with other devices! It utilizes the exact procedure like Wireless adhoc connection feature in Windows 7 and Windows Vista. When the connection is established, other Wi-Fi devices like laptops, smart phones, music players, and gaming systems can also join the Maryfi hotspot exactly like any other Wi-Fi hotspot. You Wi-Fi connection is secured by a password-protected WPA2 Encryption.

It lets you name your WiFi network and set your own password. When you set the password, and click on the hotspot you get connected. Then you can view the WiFi connection on other devices.
Maryfi is compatible with new new Windows 7 Wi-Fi devices, and many older devices that work with Windows 7 drivers. Before you start downloading Maryfi to your computer you have to download and install Microsoft Virtual Wi-Fi Miniport Adapter.