Connectify is a useful application that turns a Windows 7 laptop into a wireless hotspot. Other laptops can then connect to it wirelessly and access the Internet through it. Instead of buying a wireless router, I have connected a Windows 7 laptop to the Internet and run Connectify on it. The other Ubuntu laptop at home accesses the Internet by connecting wirelessly to the network that Connectify creates. It all works like a charm with minimum tweaking!