Awesome tool!   On Windows 7, you may have noticed the Microsoft Virtual WiFi Miniport Adapter.   This is automatically installed when you have a wireless adapter.   You may have also noticed that you can't do anything with it!   What the virtual wireless adapter does is allow you to essentially multiples your wireless adapter to join more than one network at once.   As a matter of fact, you can also use it to share your connection.   That's right!   You can actually host a wireless network from your PC!

This way, if you have a wired connection, you can share it with others by building a hotspot.   If you are on a public network that requires some sort of authentication, you can get online, then share it out with others!   Your system becomes the NAT and DHCP server on a new wireless network.   You can choose your SSID and password, but you can't disable encryption.  

VirtualRouter is a tool that exposes the features that Microsoft included but never built management applications for.   It's incredibly easy to use.   It doesn't work with 100% of wireless adapters though.   If a network adapter isn't explicitly certified for Windows 7 it won't support this feature, even though it will probably work just fine as a normal wireless adapter.

Virtual Router is a free, open-source application, and is definitely worth downloading.   Just start it up and start sharing!

Link: http://virtualrouter.codeplex.com/